Issue #439 - Remove tests from toolkit/

48 files changed, 0 insertions, 3683 deletions

diff --git a/toolkit/content/tests/browser/.eslintrc.js b/toolkit/content/tests/browser/.eslintrc.js
deleted file mode 100644
index c764b133d..000000000
--- a/toolkit/content/tests/browser/.eslintrc.js
+++ /dev/null
@@ -1,7 +0,0 @@
-"use strict";
-
-module.exports = {
-  "extends": [
-    "../../../../testing/mochitest/browser.eslintrc.js"
-  ]
-};
diff --git a/toolkit/content/tests/browser/audio.ogg b/toolkit/content/tests/browser/audio.ogg
deleted file mode 100644
index 7f1833508..000000000
--- a/toolkit/content/tests/browser/audio.ogg
+++ /dev/null
diff --git a/toolkit/content/tests/browser/browser.ini b/toolkit/content/tests/browser/browser.ini
deleted file mode 100644
index 67ba2f850..000000000
--- a/toolkit/content/tests/browser/browser.ini
+++ /dev/null
@@ -1,76 +0,0 @@
-[DEFAULT]
-support-files =
-  head.js
-  file_contentTitle.html
-  audio.ogg
-
-[browser_audioCompeting.js]
-tags = audiochannel
-support-files =
-  file_multipleAudio.html
-[browser_audioCompeting_onlyForActiveAgent.js]
-tags = audiochannel
-support-files =
-  file_multiplePlayingAudio.html
-[browser_autoscroll_disabled.js]
-[browser_block_autoplay_media.js]
-tags = audiochannel
-support-files =
-  file_multipleAudio.html
-[browser_bug295977_autoscroll_overflow.js]
-[browser_bug451286.js]
-skip-if = !e10s
-[browser_bug594509.js]
-[browser_bug982298.js]
-[browser_bug1198465.js]
-[browser_contentTitle.js]
-[browser_crash_previous_frameloader.js]
-run-if = e10s && crashreporter
-[browser_datetime_datepicker.js]
-[browser_default_image_filename.js]
-[browser_f7_caret_browsing.js]
-[browser_findbar.js]
-[browser_label_textlink.js]
-[browser_isSynthetic.js]
-support-files =
-  empty.png
-[browser_keyevents_during_autoscrolling.js]
-[browser_save_resend_postdata.js]
-support-files =
-  common/mockTransfer.js
-  data/post_form_inner.sjs
-  data/post_form_outer.sjs
-skip-if = e10s # Bug ?????? - test directly manipulates content (gBrowser.contentDocument.getElementById("postForm").submit();)
-[browser_content_url_annotation.js]
-skip-if = !e10s || !crashreporter
-support-files =
-  file_redirect.html
-  file_redirect_to.html
-[browser_bug1170531.js]
-[browser_mediaPlayback.js]
-tags = audiochannel
-support-files =
-  file_mediaPlayback.html
-  file_mediaPlaybackFrame.html
-[browser_mediaPlayback_mute.js]
-tags = audiochannel
-support-files =
-  file_mediaPlayback2.html
-  file_mediaPlaybackFrame2.html
-[browser_mediaPlayback_suspended.js]
-tags = audiochannel
-support-files =
-  file_mediaPlayback2.html
-[browser_mediaPlayback_suspended_multipleAudio.js]
-tags = audiochannel
-support-files =
-  file_multipleAudio.html
-[browser_mute.js]
-tags = audiochannel
-[browser_mute2.js]
-tags = audiochannel
-[browser_quickfind_editable.js]
-[browser_saveImageURL.js]
-support-files =
-  image.jpg
-  image_page.html
diff --git a/toolkit/content/tests/browser/browser_audioCompeting.js b/toolkit/content/tests/browser/browser_audioCompeting.js
deleted file mode 100644
index 7b6a76c1d..000000000
--- a/toolkit/content/tests/browser/browser_audioCompeting.js
+++ /dev/null
@@ -1,115 +0,0 @@
-const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_multipleAudio.html";
-
-function* wait_for_tab_playing_event(tab, expectPlaying) {
-  if (tab.soundPlaying == expectPlaying) {
-    ok(true, "The tab should " + (expectPlaying ? "" : "not ") + "be playing");
-  } else {
-    yield BrowserTestUtils.waitForEvent(tab, "TabAttrModified", false, (event) => {
-      if (event.detail.changed.indexOf("soundplaying") >= 0) {
-        is(tab.soundPlaying, expectPlaying, "The tab should " + (expectPlaying ? "" : "not ") + "be playing");
-        return true;
-      }
-      return false;
-    });
-  }
-}
-
-function play_audio_from_invisible_tab () {
-  return new Promise(resolve => {
-    var autoPlay = content.document.getElementById('autoplay');
-    if (!autoPlay) {
-      ok(false, "Can't get the audio element!");
-    }
-
-    is(autoPlay.paused, true, "Audio in tab 1 was paused by audio competing.");
-    autoPlay.play();
-    autoPlay.onpause = function() {
-      autoPlay.onpause = null;
-      ok(true, "Audio in tab 1 can't playback when other tab is playing in foreground.");
-      resolve();
-    };
-  });
-}
-
-function audio_should_keep_playing_even_go_to_background () {
-  var autoPlay = content.document.getElementById('autoplay');
-  if (!autoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(autoPlay.paused, false, "Audio in tab 2 is still playing in the background.");
-}
-
-function play_non_autoplay_audio () {
-  return new Promise(resolve => {
-    var autoPlay = content.document.getElementById('autoplay');
-    var nonAutoPlay = content.document.getElementById('nonautoplay');
-    if (!autoPlay || !nonAutoPlay) {
-      ok(false, "Can't get the audio element!");
-    }
-
-    is(nonAutoPlay.paused, true, "Non-autoplay audio isn't started playing yet.");
-    nonAutoPlay.play();
-
-    nonAutoPlay.onplay = function() {
-      nonAutoPlay.onplay = null;
-      is(nonAutoPlay.paused, false, "Start Non-autoplay audio.");
-      is(autoPlay.paused, false, "Autoplay audio is still playing.");
-      resolve();
-    };
-  });
-}
-
-add_task(function* setup_test_preference() {
-  yield new Promise(resolve => {
-    SpecialPowers.pushPrefEnv({"set": [
-      ["dom.audiochannel.audioCompeting", true],
-      ["dom.ipc.processCount", 1]
-    ]}, resolve);
-  });
-});
-
-add_task(function* cross_tabs_audio_competing () {
-  info("- open tab 1 in foreground -");
-  let tab1 = yield BrowserTestUtils.openNewForegroundTab(window.gBrowser,
-                                                         "about:blank");
-  tab1.linkedBrowser.loadURI(PAGE);
-  yield wait_for_tab_playing_event(tab1, true);
-
-  info("- open tab 2 in foreground -");
-  let tab2 = yield BrowserTestUtils.openNewForegroundTab(window.gBrowser,
-                                                        "about:blank");
-  tab2.linkedBrowser.loadURI(PAGE);
-  yield wait_for_tab_playing_event(tab1, false);
-
-  info("- open tab 3 in foreground -");
-  let tab3 = yield BrowserTestUtils.openNewForegroundTab(window.gBrowser,
-                                                         "about:blank");
-  yield ContentTask.spawn(tab2.linkedBrowser, null,
-                          audio_should_keep_playing_even_go_to_background);
-
-  info("- play audio from background tab 1 -");
-  yield ContentTask.spawn(tab1.linkedBrowser, null,
-                          play_audio_from_invisible_tab);
-
-  info("- remove tabs -");
-  yield BrowserTestUtils.removeTab(tab1);
-  yield BrowserTestUtils.removeTab(tab2);
-  yield BrowserTestUtils.removeTab(tab3);
-});
-
-add_task(function* within_one_tab_audio_competing () {
-  info("- open tab and play audio1 -");
-  let tab = yield BrowserTestUtils.openNewForegroundTab(window.gBrowser,
-                                                        "about:blank");
-  tab.linkedBrowser.loadURI(PAGE);
-  yield wait_for_tab_playing_event(tab, true);
-
-  info("- play audio2 in the same tab -");
-  yield ContentTask.spawn(tab.linkedBrowser, null,
-                          play_non_autoplay_audio);
-
-  info("- remove tab -");
-  yield BrowserTestUtils.removeTab(tab);
-});
-
diff --git a/toolkit/content/tests/browser/browser_audioCompeting_onlyForActiveAgent.js b/toolkit/content/tests/browser/browser_audioCompeting_onlyForActiveAgent.js
deleted file mode 100644
index 31cd3f624..000000000
--- a/toolkit/content/tests/browser/browser_audioCompeting_onlyForActiveAgent.js
+++ /dev/null
@@ -1,176 +0,0 @@
-const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_multiplePlayingAudio.html";
-
-var SuspendedType = {
-  NONE_SUSPENDED             : 0,
-  SUSPENDED_PAUSE            : 1,
-  SUSPENDED_BLOCK            : 2,
-  SUSPENDED_PAUSE_DISPOSABLE : 3
-};
-
-function wait_for_event(browser, event) {
-  return BrowserTestUtils.waitForEvent(browser, event, false, (event) => {
-    is(event.originalTarget, browser, "Event must be dispatched to correct browser.");
-    return true;
-  });
-}
-
-function check_all_audio_suspended(suspendedType) {
-  var audio1 = content.document.getElementById("audio1");
-  var audio2 = content.document.getElementById("audio2");
-  if (!audio1 || !audio2) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio1.computedSuspended, suspendedType,
-     "The suspeded state of audio1 is correct.");
-  is(audio2.computedSuspended, suspendedType,
-     "The suspeded state of audio2 is correct.");
-}
-
-function check_audio1_suspended(suspendedType) {
-  var audio1 = content.document.getElementById("audio1");
-  if (!audio1) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio1.computedSuspended, suspendedType,
-     "The suspeded state of audio1 is correct.");
-}
-
-function check_audio2_suspended(suspendedType) {
-  var audio2 = content.document.getElementById("audio2");
-  if (!audio2) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio2.computedSuspended, suspendedType,
-     "The suspeded state of audio2 is correct.");
-}
-
-function check_all_audio_pause_state(expectedPauseState) {
-  var audio1 = content.document.getElementById("audio1");
-  var audio2 = content.document.getElementById("audio2");
-  if (!audio1 | !audio2) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio1.paused, expectedPauseState,
-    "The pause state of audio1 is correct.");
-  is(audio2.paused, expectedPauseState,
-    "The pause state of audio2 is correct.");
-}
-
-function check_audio1_pause_state(expectedPauseState) {
-  var audio1 = content.document.getElementById("audio1");
-  if (!audio1) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio1.paused, expectedPauseState,
-    "The pause state of audio1 is correct.");
-}
-
-function check_audio2_pause_state(expectedPauseState) {
-  var audio2 = content.document.getElementById("audio2");
-  if (!audio2) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio2.paused, expectedPauseState,
-    "The pause state of audio2 is correct.");
-}
-
-function play_audio1_from_page() {
-  var audio1 = content.document.getElementById("audio1");
-  if (!audio1) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio1.paused, true, "Audio1 is paused.");
-  audio1.play();
-  return new Promise(resolve => {
-    audio1.onplay = function() {
-      audio1.onplay = null;
-      ok(true, "Audio1 started playing.");
-      resolve();
-    }
-  });
-}
-
-function stop_audio1_from_page() {
-  var audio1 = content.document.getElementById("audio1");
-  if (!audio1) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(audio1.paused, false, "Audio1 is playing.");
-  audio1.pause();
-  return new Promise(resolve => {
-    audio1.onpause = function() {
-      audio1.onpause = null;
-      ok(true, "Audio1 stopped playing.");
-      resolve();
-    }
-  });
-}
-
-function* audio_competing_for_active_agent(url, browser) {
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the default suspended state of all audio should be non-suspened -");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-
-  info("- only pause playing audio in the page -");
-  browser.pauseMedia(true /* disposable */);
-
-  info("- page shouldn't have any playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStopped");
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_all_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE_DISPOSABLE,
-                                   check_all_audio_suspended);
-
-  info("- resume audio1 from page -");
-  yield ContentTask.spawn(browser, null,
-                                   play_audio1_from_page);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio1_suspended);
-
-  info("- audio2 should still be suspended -");
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE_DISPOSABLE,
-                                   check_audio2_suspended);
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_audio2_pause_state);
-
-  info("- stop audio1 from page -");
-  yield ContentTask.spawn(browser, null,
-                                   stop_audio1_from_page);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio1_suspended);
-
-  info("- audio2 should still be suspended -");
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE_DISPOSABLE,
-                                   check_audio2_suspended);
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_audio2_pause_state);
-
-}
-
-add_task(function* setup_test_preference() {
-  yield SpecialPowers.pushPrefEnv({"set": [
-    ["media.useAudioChannelService.testing", true],
-    ["dom.audiochannel.audioCompeting", true],
-    ["dom.audiochannel.audioCompeting.allAgents", true]
-  ]});
-});
-
-add_task(function* test_suspended_pause_disposable() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, audio_competing_for_active_agent.bind(this, PAGE));
-});
diff --git a/toolkit/content/tests/browser/browser_autoscroll_disabled.js b/toolkit/content/tests/browser/browser_autoscroll_disabled.js
deleted file mode 100644
index 07c6174ab..000000000
--- a/toolkit/content/tests/browser/browser_autoscroll_disabled.js
+++ /dev/null
@@ -1,67 +0,0 @@
-add_task(function* ()
-{
-  const kPrefName_AutoScroll = "general.autoScroll";
-  Services.prefs.setBoolPref(kPrefName_AutoScroll, false);
-
-  let dataUri = 'data:text/html,<html><body id="i" style="overflow-y: scroll"><div style="height: 2000px"></div>\
-      <iframe id="iframe" style="display: none;"></iframe>\
-</body></html>';
-
-  let loadedPromise = BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
-  gBrowser.loadURI(dataUri);
-  yield loadedPromise;
-
-  yield BrowserTestUtils.synthesizeMouse("#i", 50, 50, { button: 1 },
-                                         gBrowser.selectedBrowser);
-
-  yield ContentTask.spawn(gBrowser.selectedBrowser, { }, function* () {
-    var iframe = content.document.getElementById("iframe");
-
-    if (iframe) {
-      var e = new iframe.contentWindow.PageTransitionEvent("pagehide",
-                                                           { bubbles: true,
-                                                             cancelable: true,
-                                                             persisted: false });
-      iframe.contentDocument.dispatchEvent(e);
-      iframe.contentDocument.documentElement.dispatchEvent(e);
-    }
-  });
-
-  yield BrowserTestUtils.synthesizeMouse("#i", 100, 100,
-                                         { type: "mousemove", clickCount: "0" },
-                                         gBrowser.selectedBrowser);
-
-  // If scrolling didn't work, we wouldn't do any redraws and thus time out, so
-  // request and force redraws to get the chance to check for scrolling at all.
-  yield new Promise(resolve => window.requestAnimationFrame(resolve));
-
-  let msg = yield ContentTask.spawn(gBrowser.selectedBrowser, { }, function* () {
-    // Skip the first animation frame callback as it's the same callback that
-    // the browser uses to kick off the scrolling.
-    return new Promise(resolve => {
-      function checkScroll() {
-        let msg = "";
-        let elem = content.document.getElementById('i');
-        if (elem.scrollTop != 0) {
-          msg += "element should not have scrolled vertically";
-        }
-        if (elem.scrollLeft != 0) {
-          msg += "element should not have scrolled horizontally";
-        }
-
-        resolve(msg);
-      }
-
-      content.requestAnimationFrame(checkScroll);
-    });
-  });
-
-  ok(!msg, "element scroll " + msg);
-
-  // restore the changed prefs
-  if (Services.prefs.prefHasUserValue(kPrefName_AutoScroll))
-    Services.prefs.clearUserPref(kPrefName_AutoScroll);
-
-  // wait for focus to fix a failure in the next test if the latter runs too soon.
-  yield SimpleTest.promiseFocus();
-});
diff --git a/toolkit/content/tests/browser/browser_block_autoplay_media.js b/toolkit/content/tests/browser/browser_block_autoplay_media.js
deleted file mode 100644
index 3b2a309b9..000000000
--- a/toolkit/content/tests/browser/browser_block_autoplay_media.js
+++ /dev/null
@@ -1,87 +0,0 @@
-const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_multipleAudio.html";
-
-var SuspendedType = {
-  NONE_SUSPENDED             : 0,
-  SUSPENDED_PAUSE            : 1,
-  SUSPENDED_BLOCK            : 2,
-  SUSPENDED_PAUSE_DISPOSABLE : 3
-};
-
-function* wait_for_tab_playing_event(tab, expectPlaying) {
-  if (tab.soundPlaying == expectPlaying) {
-    ok(true, "The tab should " + (expectPlaying ? "" : "not ") + "be playing");
-  } else {
-    yield BrowserTestUtils.waitForEvent(tab, "TabAttrModified", false, (event) => {
-      if (event.detail.changed.indexOf("soundplaying") >= 0) {
-        is(tab.soundPlaying, expectPlaying, "The tab should " + (expectPlaying ? "" : "not ") + "be playing");
-        return true;
-      }
-      return false;
-    });
-  }
-}
-
-function check_audio_suspended(suspendedType) {
-  var autoPlay = content.document.getElementById('autoplay');
-  if (!autoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(autoPlay.computedSuspended, suspendedType,
-     "The suspeded state of autoplay audio is correct.");
-}
-
-add_task(function* setup_test_preference() {
-  yield new Promise(resolve => {
-    SpecialPowers.pushPrefEnv({"set": [
-      ["media.useAudioChannelService.testing", true],
-      ["media.block-autoplay-until-in-foreground", true]
-    ]}, resolve);
-  });
-});
-
-add_task(function* block_autoplay_media() {
-  info("- open new background tab1 -");
-  let tab1 = window.gBrowser.addTab("about:blank");
-  tab1.linkedBrowser.loadURI(PAGE);
-  yield BrowserTestUtils.browserLoaded(tab1.linkedBrowser);
-
-  info("- should block autoplay media for non-visited tab1 -");
-  yield ContentTask.spawn(tab1.linkedBrowser, SuspendedType.SUSPENDED_BLOCK,
-                          check_audio_suspended);
-
-  info("- open new background tab2 -");
-  let tab2 = window.gBrowser.addTab("about:blank");
-  tab2.linkedBrowser.loadURI(PAGE);
-  yield BrowserTestUtils.browserLoaded(tab2.linkedBrowser);
-
-  info("- should block autoplay for non-visited tab2 -");
-  yield ContentTask.spawn(tab2.linkedBrowser, SuspendedType.SUSPENDED_BLOCK,
-                          check_audio_suspended);
-
-  info("- select tab1 as foreground tab -");
-  yield BrowserTestUtils.switchTab(window.gBrowser, tab1);
-
-  info("- media should be unblocked because the tab was visited -");
-  yield wait_for_tab_playing_event(tab1, true);
-  yield ContentTask.spawn(tab1.linkedBrowser, SuspendedType.NONE_SUSPENDED,
-                          check_audio_suspended);
-
-  info("- open another new foreground tab3 -");
-  let tab3 = yield BrowserTestUtils.openNewForegroundTab(window.gBrowser,
-                                                         "about:blank");
-  info("- should still play media from tab1 -");
-  yield wait_for_tab_playing_event(tab1, true);
-  yield ContentTask.spawn(tab1.linkedBrowser, SuspendedType.NONE_SUSPENDED,
-                          check_audio_suspended);
-
-  info("- should still block media from tab2 -");
-  yield wait_for_tab_playing_event(tab2, false);
-  yield ContentTask.spawn(tab2.linkedBrowser, SuspendedType.SUSPENDED_BLOCK,
-                          check_audio_suspended);
-
-  info("- remove tabs -");
-  yield BrowserTestUtils.removeTab(tab1);
-  yield BrowserTestUtils.removeTab(tab2);
-  yield BrowserTestUtils.removeTab(tab3);
-});
diff --git a/toolkit/content/tests/browser/browser_bug1170531.js b/toolkit/content/tests/browser/browser_bug1170531.js
deleted file mode 100644
index 49df5661a..000000000
--- a/toolkit/content/tests/browser/browser_bug1170531.js
+++ /dev/null
@@ -1,92 +0,0 @@
-// Test for bug 1170531
-// https://bugzilla.mozilla.org/show_bug.cgi?id=1170531
-
-add_task(function* () {
-  // Get a bunch of DOM nodes
-  let winUtils = window.QueryInterface(Ci.nsIInterfaceRequestor).
-        getInterface(Ci.nsIDOMWindowUtils);
-
-  let editMenu = document.getElementById("edit-menu");
-  let menubar = editMenu.parentNode;
-  let menuPopup = editMenu.menupopup;
-  let editMenuIndex = -1;
-  for (let i = 0; i < menubar.children.length; i++) {
-    if (menubar.children[i] === editMenu) {
-      editMenuIndex = i;
-      break;
-    }
-  }
-
-  let closeMenu = function(aCallback) {
-    if (OS.Constants.Sys.Name == "Darwin") {
-      executeSoon(aCallback);
-      return;
-    }
-
-    menuPopup.addEventListener("popuphidden", function onPopupHidden() {
-      menuPopup.removeEventListener("popuphidden", onPopupHidden, false);
-      executeSoon(aCallback);
-    }, false);
-
-    executeSoon(function() {
-      editMenu.open = false;
-    });
-  };
-
-  let openMenu = function(aCallback) {
-    if (OS.Constants.Sys.Name == "Darwin") {
-      goUpdateGlobalEditMenuItems();
-      // On OSX, we have a native menu, so it has to be updated. In single process browsers,
-      // this happens synchronously, but in e10s, we have to wait for the main thread
-      // to deal with it for us. 1 second should be plenty of time.
-      setTimeout(aCallback, 1000);
-      return;
-    }
-
-    menuPopup.addEventListener("popupshown", function onPopupShown() {
-      menuPopup.removeEventListener("popupshown", onPopupShown, false);
-      executeSoon(aCallback);
-    }, false);
-
-    executeSoon(function() {
-      editMenu.open = true;
-    });
-  };
-
-  yield BrowserTestUtils.withNewTab({ gBrowser: gBrowser, url: "about:blank" }, function* (browser) {
-    let menu_cut_disabled, menu_copy_disabled;
-
-    yield BrowserTestUtils.loadURI(browser, "data:text/html,<div>hello!</div>");
-    yield BrowserTestUtils.browserLoaded(browser);
-    browser.focus();
-    yield new Promise(resolve => waitForFocus(resolve, window));
-    yield new Promise(openMenu);
-    menu_cut_disabled = menuPopup.querySelector("#menu_cut").getAttribute('disabled') == "true";
-    is(menu_cut_disabled, false, "menu_cut should be enabled");
-    menu_copy_disabled = menuPopup.querySelector("#menu_copy").getAttribute('disabled') == "true";
-    is(menu_copy_disabled, false, "menu_copy should be enabled");
-    yield new Promise(closeMenu);
-
-    yield BrowserTestUtils.loadURI(browser, "data:text/html,<div contentEditable='true'>hello!</div>");
-    yield BrowserTestUtils.browserLoaded(browser);
-    browser.focus();
-    yield new Promise(resolve => waitForFocus(resolve, window));
-    yield new Promise(openMenu);
-    menu_cut_disabled = menuPopup.querySelector("#menu_cut").getAttribute('disabled') == "true";
-    is(menu_cut_disabled, false, "menu_cut should be enabled");
-    menu_copy_disabled = menuPopup.querySelector("#menu_copy").getAttribute('disabled') == "true";
-    is(menu_copy_disabled, false, "menu_copy should be enabled");
-    yield new Promise(closeMenu);
-
-    yield BrowserTestUtils.loadURI(browser, "about:preferences");
-    yield BrowserTestUtils.browserLoaded(browser);
-    browser.focus();
-    yield new Promise(resolve => waitForFocus(resolve, window));
-    yield new Promise(openMenu);
-    menu_cut_disabled = menuPopup.querySelector("#menu_cut").getAttribute('disabled') == "true";
-    is(menu_cut_disabled, true, "menu_cut should be disabled");
-    menu_copy_disabled = menuPopup.querySelector("#menu_copy").getAttribute('disabled') == "true";
-    is(menu_copy_disabled, true, "menu_copy should be disabled");
-    yield new Promise(closeMenu);
-  });
-});
diff --git a/toolkit/content/tests/browser/browser_bug1198465.js b/toolkit/content/tests/browser/browser_bug1198465.js
deleted file mode 100644
index a9cc83e12..000000000
--- a/toolkit/content/tests/browser/browser_bug1198465.js
+++ /dev/null
@@ -1,75 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/ */
-
-var kPrefName = "accessibility.typeaheadfind.prefillwithselection";
-var kEmptyURI = "data:text/html,";
-
-// This pref is false by default in OSX; ensure the test still works there.
-Services.prefs.setBoolPref(kPrefName, true);
-
-registerCleanupFunction(function() {
-  Services.prefs.clearUserPref(kPrefName);
-});
-
-add_task(function* () {
-  let aTab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, kEmptyURI);
-  ok(!gFindBarInitialized, "findbar isn't initialized yet");
-
-  // Note: the use case here is when the user types directly in the findbar
-  // _before_ it's prefilled with a text selection in the page.
-
-  // So `yield BrowserTestUtils.sendChar()` can't be used here:
-  //  - synthesizing a key in the browser won't actually send it to the
-  //    findbar; the findbar isn't part of the browser content.
-  //  - we need to _not_ wait for _startFindDeferred to be resolved; yielding
-  //    a synthesized keypress on the browser implicitely happens after the
-  //    browser has dispatched its return message with the prefill value for
-  //    the findbar, which essentially nulls these tests.
-
-  let findBar = gFindBar;
-  is(findBar._findField.value, "", "findbar is empty");
-
-  // Test 1
-  //  Any input in the findbar should erase a previous search.
-
-  findBar._findField.value = "xy";
-  findBar.startFind();
-  is(findBar._findField.value, "xy", "findbar should have xy initial query");
-  is(findBar._findField.mInputField,
-    document.activeElement,
-    "findbar is now focused");
-
-  EventUtils.sendChar("z", window);
-  is(findBar._findField.value, "z", "z erases xy");
-
-  findBar._findField.value = "";
-  ok(!findBar._findField.value, "erase findbar after first test");
-
-  // Test 2
-  //  Prefilling the findbar should be ignored if a search has been run.
-
-  findBar.startFind();
-  ok(findBar._startFindDeferred, "prefilled value hasn't been fetched yet");
-  is(findBar._findField.mInputField,
-    document.activeElement,
-    "findbar is still focused");
-
-  EventUtils.sendChar("a", window);
-  EventUtils.sendChar("b", window);
-  is(findBar._findField.value, "ab", "initial ab typed in the findbar");
-
-  // This resolves _startFindDeferred if it's still pending; let's just skip
-  // over waiting for the browser's return message that should do this as it
-  // doesn't really matter.
-  findBar.onCurrentSelection("foo", true);
-  ok(!findBar._startFindDeferred, "prefilled value fetched");
-  is(findBar._findField.value, "ab", "ab kept instead of prefill value");
-
-  EventUtils.sendChar("c", window);
-  is(findBar._findField.value, "abc", "c is appended after ab");
-
-  // Clear the findField value to make the test  run successfully
-  // for multiple runs in the same browser session.
-  findBar._findField.value = "";
-  yield BrowserTestUtils.removeTab(aTab);
-});
diff --git a/toolkit/content/tests/browser/browser_bug295977_autoscroll_overflow.js b/toolkit/content/tests/browser/browser_bug295977_autoscroll_overflow.js
deleted file mode 100644
index 958afc868..000000000
--- a/toolkit/content/tests/browser/browser_bug295977_autoscroll_overflow.js
+++ /dev/null
@@ -1,214 +0,0 @@
-requestLongerTimeout(2);
-add_task(function* ()
-{
-  function pushPref(name, value) {
-    return new Promise(resolve => SpecialPowers.pushPrefEnv({"set": [[name, value]]}, resolve));
-  }
-
-  yield pushPref("general.autoScroll", true);
-
-  const expectScrollNone = 0;
-  const expectScrollVert = 1;
-  const expectScrollHori = 2;
-  const expectScrollBoth = 3;
-
-  var allTests = [
-    {dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><body><style type="text/css">div { display: inline-block; }</style>\
-      <div id="a" style="width: 100px; height: 100px; overflow: hidden;"><div style="width: 200px; height: 200px;"></div></div>\
-      <div id="b" style="width: 100px; height: 100px; overflow: auto;"><div style="width: 200px; height: 200px;"></div></div>\
-      <div id="c" style="width: 100px; height: 100px; overflow-x: auto; overflow-y: hidden;"><div style="width: 200px; height: 200px;"></div></div>\
-      <div id="d" style="width: 100px; height: 100px; overflow-y: auto; overflow-x: hidden;"><div style="width: 200px; height: 200px;"></div></div>\
-      <select id="e" style="width: 100px; height: 100px;" multiple="multiple"><option>aaaaaaaaaaaaaaaaaaaaaaaa</option><option>a</option><option>a</option>\
-      <option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option>\
-      <option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option></select>\
-      <select id="f" style="width: 100px; height: 100px;"><option>a</option><option>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</option><option>a</option>\
-      <option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option>\
-      <option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option><option>a</option></select>\
-      <div id="g" style="width: 99px; height: 99px; border: 10px solid black; margin: 10px; overflow: auto;"><div style="width: 100px; height: 100px;"></div></div>\
-      <div id="h" style="width: 100px; height: 100px; overflow: -moz-hidden-unscrollable;"><div style="width: 200px; height: 200px;"></div></div>\
-      <iframe id="iframe" style="display: none;"></iframe>\
-      </body></html>'},
-    {elem: 'a', expected: expectScrollNone},
-    {elem: 'b', expected: expectScrollBoth},
-    {elem: 'c', expected: expectScrollHori},
-    {elem: 'd', expected: expectScrollVert},
-    {elem: 'e', expected: expectScrollVert},
-    {elem: 'f', expected: expectScrollNone},
-    {elem: 'g', expected: expectScrollBoth},
-    {elem: 'h', expected: expectScrollNone},
-    {dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><body id="i" style="overflow-y: scroll"><div style="height: 2000px"></div>\
-      <iframe id="iframe" style="display: none;"></iframe>\
-      </body></html>'},
-    {elem: 'i', expected: expectScrollVert}, // bug 695121
-    {dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><style>html, body { width: 100%; height: 100%; overflow-x: hidden; overflow-y: scroll; }</style>\
-      <body id="j"><div style="height: 2000px"></div>\
-      <iframe id="iframe" style="display: none;"></iframe>\
-      </body></html>'},
-    {elem: 'j', expected: expectScrollVert},  // bug 914251
-    {dataUri: 'data:text/html,<html><head><meta charset="utf-8">\
-<style>\
-body > div {scroll-behavior: smooth;width: 300px;height: 300px;overflow: scroll;}\
-body > div > div {width: 1000px;height: 1000px;}\
-</style>\
-</head><body><div id="t"><div></div></div></body></html>'},
-    {elem: 't', expected: expectScrollBoth}, // bug 1308775
-    {dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><body>\
-<div id="k" style="height: 150px;  width: 200px; overflow: scroll; border: 1px solid black;">\
-<iframe style="height: 200px; width: 300px;"></iframe>\
-</div>\
-<div id="l" style="height: 150px;  width: 300px; overflow: scroll; border: 1px dashed black;">\
-<iframe style="height: 200px; width: 200px;" src="data:text/html,<div style=\'border: 5px solid blue; height: 200%; width: 200%;\'></div>"></iframe>\
-</div>\
-<iframe id="m"></iframe>\
-<div style="height: 200%; border: 5px dashed black;">filler to make document overflow: scroll;</div>\
-</body></html>'},
-    {elem: 'k', expected: expectScrollBoth},
-    {elem: 'k', expected: expectScrollNone, testwindow: true},
-    {elem: 'l', expected: expectScrollNone},
-    {elem: 'm', expected: expectScrollVert, testwindow: true},
-    {dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><body>\
-<img width="100" height="100" alt="image map" usemap="%23planetmap">\
-<map name="planetmap">\
-  <area id="n" shape="rect" coords="0,0,100,100" href="javascript:void(null)">\
-</map>\
-<a href="javascript:void(null)" id="o" style="width: 100px; height: 100px; border: 1px solid black; display: inline-block; vertical-align: top;">link</a>\
-<input id="p" style="width: 100px; height: 100px; vertical-align: top;">\
-<textarea id="q" style="width: 100px; height: 100px; vertical-align: top;"></textarea>\
-<div style="height: 200%; border: 1px solid black;"></div>\
-</body></html>'},
-    {elem: 'n', expected: expectScrollNone, testwindow: true},
-    {elem: 'o', expected: expectScrollNone, testwindow: true},
-    {elem: 'p', expected: expectScrollVert, testwindow: true, middlemousepastepref: false},
-    {elem: 'q', expected: expectScrollVert, testwindow: true, middlemousepastepref: false},
-    {dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><body>\
-<input id="r" style="width: 100px; height: 100px; vertical-align: top;">\
-<textarea id="s" style="width: 100px; height: 100px; vertical-align: top;"></textarea>\
-<div style="height: 200%; border: 1px solid black;"></div>\
-</body></html>'},
-    {elem: 'r', expected: expectScrollNone, testwindow: true, middlemousepastepref: true},
-    {elem: 's', expected: expectScrollNone, testwindow: true, middlemousepastepref: true}
-  ];
-
-  for (let test of allTests) {
-    if (test.dataUri) {
-      let loadedPromise = BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
-      gBrowser.loadURI(test.dataUri);
-      yield loadedPromise;
-      continue;
-     }
-
-    let prefsChanged = (test.middlemousepastepref == false || test.middlemousepastepref == true);
-    if (prefsChanged) {
-      yield pushPref("middlemouse.paste", test.middlemousepastepref);
-    }
-
-    yield BrowserTestUtils.synthesizeMouse("#" + test.elem, 50, 80, { button: 1 },
-                                           gBrowser.selectedBrowser);
-
-    // This ensures bug 605127 is fixed: pagehide in an unrelated document
-    // should not cancel the autoscroll.
-    yield ContentTask.spawn(gBrowser.selectedBrowser, { }, function* () {
-      var iframe = content.document.getElementById("iframe");
-
-      if (iframe) {
-        var e = new iframe.contentWindow.PageTransitionEvent("pagehide",
-                                                             { bubbles: true,
-                                                               cancelable: true,
-                                                               persisted: false });
-        iframe.contentDocument.dispatchEvent(e);
-        iframe.contentDocument.documentElement.dispatchEvent(e);
-      }
-    });
-
-    is(document.activeElement, gBrowser.selectedBrowser, "Browser still focused after autoscroll started");
-
-    yield BrowserTestUtils.synthesizeMouse("#" + test.elem, 100, 100,
-                                           { type: "mousemove", clickCount: "0" },
-                                           gBrowser.selectedBrowser);
-
-    if (prefsChanged) {
-      yield new Promise(resolve => SpecialPowers.popPrefEnv(resolve));
-    }
-
-    // Start checking for the scroll.
-    let firstTimestamp = undefined;
-    let timeCompensation;
-    do {
-      let timestamp = yield new Promise(resolve => window.requestAnimationFrame(resolve));
-      if (firstTimestamp === undefined) {
-        firstTimestamp = timestamp;
-      }
-
-      // This value is calculated similarly to the value of the same name in
-      // ClickEventHandler.autoscrollLoop, except here it's cumulative across
-      // all frames after the first one instead of being based only on the
-      // current frame.
-      timeCompensation = (timestamp - firstTimestamp) / 20;
-      info("timestamp=" + timestamp + " firstTimestamp=" + firstTimestamp +
-           " timeCompensation=" + timeCompensation);
-
-      // Try to wait until enough time has passed to allow the scroll to happen.
-      // autoscrollLoop incrementally scrolls during each animation frame, but
-      // due to how its calculations work, when a frame is very close to the
-      // previous frame, no scrolling may actually occur during that frame.
-      // After 100ms's worth of frames, timeCompensation will be 1, making it
-      // more likely that the accumulated scroll in autoscrollLoop will be >= 1,
-      // although it also depends on acceleration, which here in this test
-      // should be > 1 due to how it synthesizes mouse events below.
-    } while (timeCompensation < 5);
-
-    // Close the autoscroll popup by synthesizing Esc.
-    EventUtils.synthesizeKey("VK_ESCAPE", {});
-    let scrollVert = test.expected & expectScrollVert;
-    let scrollHori = test.expected & expectScrollHori;
-
-    yield ContentTask.spawn(gBrowser.selectedBrowser,
-                            { scrollVert : scrollVert,
-                              scrollHori: scrollHori,
-                              elemid : test.elem,
-                              checkWindow: test.testwindow },
-      function* (args) {
-        let msg = "";
-        if (args.checkWindow) {
-          if (!((args.scrollVert && content.scrollY > 0) ||
-                (!args.scrollVert && content.scrollY == 0))) {
-            msg += "Failed: ";
-          }
-          msg += 'Window for ' + args.elemid + ' should' + (args.scrollVert ? '' : ' not') + ' have scrolled vertically\n';
-
-          if (!((args.scrollHori && content.scrollX > 0) ||
-                (!args.scrollHori && content.scrollX == 0))) {
-            msg += "Failed: ";
-          }
-          msg += ' Window for ' + args.elemid + ' should' + (args.scrollHori ? '' : ' not') + ' have scrolled horizontally\n';
-        } else {
-          let elem = content.document.getElementById(args.elemid);
-          if (!((args.scrollVert && elem.scrollTop > 0) ||
-                (!args.scrollVert && elem.scrollTop == 0))) {
-            msg += "Failed: ";
-          }
-          msg += ' ' + args.elemid + ' should' + (args.scrollVert ? '' : ' not') + ' have scrolled vertically\n';
-          if (!((args.scrollHori && elem.scrollLeft > 0) ||
-                (!args.scrollHori && elem.scrollLeft == 0))) {
-            msg += "Failed: ";
-          }
-          msg += args.elemid + ' should' + (args.scrollHori ? '' : ' not') + ' have scrolled horizontally';
-        }
-
-        Assert.ok(msg.indexOf("Failed") == -1, msg);
-       }
-    );
-
-    // Before continuing the test, we need to ensure that the IPC
-    // message that stops autoscrolling has had time to arrive.
-    yield new Promise(resolve => executeSoon(resolve));
-  }
-
-  // remove 2 tabs that were opened by middle-click on links
-  while (gBrowser.visibleTabs.length > 1) {
-    gBrowser.removeTab(gBrowser.visibleTabs[gBrowser.visibleTabs.length - 1]);
-  }
-
-  // wait for focus to fix a failure in the next test if the latter runs too soon.
-  yield SimpleTest.promiseFocus();
-});
diff --git a/toolkit/content/tests/browser/browser_bug451286.js b/toolkit/content/tests/browser/browser_bug451286.js
deleted file mode 100644
index a5dadeb84..000000000
--- a/toolkit/content/tests/browser/browser_bug451286.js
+++ /dev/null
@@ -1,152 +0,0 @@
-Services.scriptloader.loadSubScript("chrome://mochikit/content/tests/SimpleTest/WindowSnapshot.js", this);
-
-add_task(function*() {
-  const SEARCH_TEXT = "text";
-  const DATAURI = "data:text/html," + SEARCH_TEXT;
-
-  // Bug 451286. An iframe that should be highlighted
-  let visible = "<iframe id='visible' src='" + DATAURI + "'></iframe>";
-
-  // Bug 493658. An invisible iframe that shouldn't interfere with
-  // highlighting matches lying after it in the document
-  let invisible = "<iframe id='invisible' style='display: none;' " +
-                  "src='" + DATAURI + "'></iframe>";
-
-  let uri = DATAURI + invisible + SEARCH_TEXT + visible + SEARCH_TEXT;
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, uri);
-  let contentRect = tab.linkedBrowser.getBoundingClientRect();
-  let noHighlightSnapshot = snapshotRect(window, contentRect);
-  ok(noHighlightSnapshot, "Got noHighlightSnapshot");
-
-  yield openFindBarAndWait();
-  gFindBar._findField.value = SEARCH_TEXT;
-  yield findAgainAndWait();
-  var matchCase = gFindBar.getElement("find-case-sensitive");
-  if (matchCase.checked)
-    matchCase.doCommand();
-
-  // Turn on highlighting
-  yield toggleHighlightAndWait(true);
-  yield closeFindBarAndWait();
-
-  // Take snapshot of highlighting
-  let findSnapshot = snapshotRect(window, contentRect);
-  ok(findSnapshot, "Got findSnapshot");
-
-  // Now, remove the highlighting, and take a snapshot to compare
-  // to our original state
-  yield openFindBarAndWait();
-  yield toggleHighlightAndWait(false);
-  yield closeFindBarAndWait();
-
-  let unhighlightSnapshot = snapshotRect(window, contentRect);
-  ok(unhighlightSnapshot, "Got unhighlightSnapshot");
-
-  // Select the matches that should have been highlighted manually
-  yield ContentTask.spawn(tab.linkedBrowser, null, function*() {
-    let doc = content.document;
-    let win = doc.defaultView;
-
-    // Create a manual highlight in the visible iframe to test bug 451286
-    let iframe = doc.getElementById("visible");
-    let ifBody = iframe.contentDocument.body;
-    let range = iframe.contentDocument.createRange();
-    range.selectNodeContents(ifBody.childNodes[0]);
-    let ifWindow = iframe.contentWindow;
-    let ifDocShell = ifWindow.QueryInterface(Ci.nsIInterfaceRequestor)
-                             .getInterface(Ci.nsIWebNavigation)
-                             .QueryInterface(Ci.nsIDocShell);
-
-    let ifController = ifDocShell.QueryInterface(Ci.nsIInterfaceRequestor)
-                                 .getInterface(Ci.nsISelectionDisplay)
-                                 .QueryInterface(Ci.nsISelectionController);
-
-    let frameFindSelection =
-      ifController.getSelection(ifController.SELECTION_FIND);
-    frameFindSelection.addRange(range);
-
-    // Create manual highlights in the main document (the matches that lie
-    // before/after the iframes
-    let docShell = win.QueryInterface(Ci.nsIInterfaceRequestor)
-                      .getInterface(Ci.nsIWebNavigation)
-                      .QueryInterface(Ci.nsIDocShell);
-
-    let controller = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
-                             .getInterface(Ci.nsISelectionDisplay)
-                             .QueryInterface(Ci.nsISelectionController);
-
-    let docFindSelection =
-      controller.getSelection(ifController.SELECTION_FIND);
-
-    range = doc.createRange();
-    range.selectNodeContents(doc.body.childNodes[0]);
-    docFindSelection.addRange(range);
-    range = doc.createRange();
-    range.selectNodeContents(doc.body.childNodes[2]);
-    docFindSelection.addRange(range);
-    range = doc.createRange();
-    range.selectNodeContents(doc.body.childNodes[4]);
-    docFindSelection.addRange(range);
-  });
-
-  // Take snapshot of manual highlighting
-  let manualSnapshot = snapshotRect(window, contentRect);
-  ok(manualSnapshot, "Got manualSnapshot");
-
-  // Test 1: Were the matches in iframe correctly highlighted?
-  let res = compareSnapshots(findSnapshot, manualSnapshot, true);
-  ok(res[0], "Matches found in iframe correctly highlighted");
-
-  // Test 2: Were the matches in iframe correctly unhighlighted?
-  res = compareSnapshots(noHighlightSnapshot, unhighlightSnapshot, true);
-  ok(res[0], "Highlighting in iframe correctly removed");
-
-  yield BrowserTestUtils.removeTab(tab);
-});
-
-function toggleHighlightAndWait(shouldHighlight) {
-  return new Promise((resolve) => {
-    let listener = {
-      onFindResult() {},
-      onHighlightFinished() {
-        gFindBar.browser.finder.removeResultListener(listener);
-        resolve();
-      },
-      onMatchesCountResult() {}
-    };
-    gFindBar.browser.finder.addResultListener(listener);
-    gFindBar.toggleHighlight(shouldHighlight);
-  });
-}
-
-function findAgainAndWait() {
-  return new Promise(resolve => {
-    let listener = {
-      onFindResult() {
-        gFindBar.browser.finder.removeResultListener(listener);
-        resolve();
-      },
-      onHighlightFinished() {},
-      onMatchesCountResult() {}
-    };
-    gFindBar.browser.finder.addResultListener(listener);
-    gFindBar.onFindAgainCommand();
-  });
-}
-
-function* openFindBarAndWait() {
-  let awaitTransitionEnd = BrowserTestUtils.waitForEvent(gFindBar, "transitionend");
-  gFindBar.open();
-  yield awaitTransitionEnd;
-}
-
-// This test is comparing snapshots. It is necessary to wait for the gFindBar
-// to close before taking the snapshot so the gFindBar does not take up space
-// on the new snapshot.
-function* closeFindBarAndWait() {
-  let awaitTransitionEnd = BrowserTestUtils.waitForEvent(gFindBar, "transitionend", false, event => {
-    return event.propertyName == "visibility";
-  });
-  gFindBar.close();
-  yield awaitTransitionEnd;
-}
diff --git a/toolkit/content/tests/browser/browser_bug594509.js b/toolkit/content/tests/browser/browser_bug594509.js
deleted file mode 100644
index e67b05f85..000000000
--- a/toolkit/content/tests/browser/browser_bug594509.js
+++ /dev/null
@@ -1,9 +0,0 @@
-add_task(function* () {
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, "about:rights");
-
-  yield ContentTask.spawn(tab.linkedBrowser, null, function* () {
-    Assert.ok(content.document.getElementById("your-rights"), "about:rights content loaded");
-  });
-
-  yield BrowserTestUtils.removeTab(tab);
-});
diff --git a/toolkit/content/tests/browser/browser_bug982298.js b/toolkit/content/tests/browser/browser_bug982298.js
deleted file mode 100644
index 047340c5c..000000000
--- a/toolkit/content/tests/browser/browser_bug982298.js
+++ /dev/null
@@ -1,70 +0,0 @@
-const scrollHtml =
-  "<textarea id=\"textarea1\" row=2>Firefox\n\nFirefox\n\n\n\n\n\n\n\n\n\n" +
-  "</textarea><a href=\"about:blank\">blank</a>";
-
-add_task(function*() {
-  let url = "data:text/html;base64," + btoa(scrollHtml);
-  yield BrowserTestUtils.withNewTab({gBrowser, url}, function*(browser) {
-    let awaitFindResult = new Promise(resolve => {
-      let listener = {
-        onFindResult(aData) {
-          info("got find result");
-          browser.finder.removeResultListener(listener);
-
-          ok(aData.result == Ci.nsITypeAheadFind.FIND_FOUND, "should find string");
-          resolve();
-        },
-        onCurrentSelection() {},
-        onMatchesCountResult() {}
-      };
-      info("about to add results listener, open find bar, and send 'F' string");
-      browser.finder.addResultListener(listener);
-    });
-    gFindBar.onFindCommand();
-    EventUtils.sendString("F");
-    info("added result listener and sent string 'F'");
-    yield awaitFindResult;
-
-    let awaitScrollDone = BrowserTestUtils.waitForMessage(browser.messageManager, "ScrollDone");
-    // scroll textarea to bottom
-    const scrollTest =
-      "var textarea = content.document.getElementById(\"textarea1\");" +
-      "textarea.scrollTop = textarea.scrollHeight;" +
-      "sendAsyncMessage(\"ScrollDone\", { });"
-    browser.messageManager.loadFrameScript("data:text/javascript;base64," +
-                                           btoa(scrollTest), false);
-    yield awaitScrollDone;
-    info("got ScrollDone event");
-    yield BrowserTestUtils.loadURI(browser, "about:blank");
-    yield BrowserTestUtils.browserLoaded(browser);
-
-    ok(browser.currentURI.spec == "about:blank", "got load event for about:blank");
-
-    let awaitFindResult2 = new Promise(resolve => {
-      let listener = {
-        onFindResult(aData) {
-          info("got find result #2");
-          browser.finder.removeResultListener(listener);
-          resolve();
-        },
-        onCurrentSelection() {},
-        onMatchesCountResult() {}
-      };
-
-      browser.finder.addResultListener(listener);
-      info("added result listener");
-    });
-    // find again needs delay for crash test
-    setTimeout(function() {
-      // ignore exception if occured
-      try {
-        info("about to send find again command");
-        gFindBar.onFindAgainCommand(false);
-        info("sent find again command");
-      } catch (e) {
-        info("got exception from onFindAgainCommand: " + e);
-      }
-    }, 0);
-    yield awaitFindResult2;
-  });
-});
diff --git a/toolkit/content/tests/browser/browser_contentTitle.js b/toolkit/content/tests/browser/browser_contentTitle.js
deleted file mode 100644
index e7966e565..000000000
--- a/toolkit/content/tests/browser/browser_contentTitle.js
+++ /dev/null
@@ -1,16 +0,0 @@
-var url = "https://example.com/browser/toolkit/content/tests/browser/file_contentTitle.html";
-
-add_task(function*() {
-  let tab = gBrowser.selectedTab = gBrowser.addTab(url);
-  let browser = tab.linkedBrowser;
-  yield new Promise((resolve) => {
-    addEventListener("TestLocationChange", function listener() {
-      removeEventListener("TestLocationChange", listener);
-      resolve();
-    }, true, true);
-  });
-
-  is(gBrowser.contentTitle, "Test Page", "Should have the right title.");
-
-  gBrowser.removeTab(tab);
-});
diff --git a/toolkit/content/tests/browser/browser_content_url_annotation.js b/toolkit/content/tests/browser/browser_content_url_annotation.js
deleted file mode 100644
index 1a4cee4c6..000000000
--- a/toolkit/content/tests/browser/browser_content_url_annotation.js
+++ /dev/null
@@ -1,73 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/ */
-/* global Services, requestLongerTimeout, TestUtils, BrowserTestUtils,
- ok, info, dump, is, Ci, Cu, Components, ctypes, privateNoteIntentionalCrash,
- gBrowser, add_task, addEventListener, removeEventListener, ContentTask */
-
-"use strict";
-
-// Running this test in ASAN is slow.
-requestLongerTimeout(2);
-
-/**
- * Removes a file from a directory. This is a no-op if the file does not
- * exist.
- *
- * @param directory
- *        The nsIFile representing the directory to remove from.
- * @param filename
- *        A string for the file to remove from the directory.
- */
-function removeFile(directory, filename) {
-  let file = directory.clone();
-  file.append(filename);
-  if (file.exists()) {
-    file.remove(false);
-  }
-}
-
-/**
- * Returns the directory where crash dumps are stored.
- *
- * @return nsIFile
- */
-function getMinidumpDirectory() {
-  let dir = Services.dirsvc.get('ProfD', Ci.nsIFile);
-  dir.append("minidumps");
-  return dir;
-}
-
-/**
- * Checks that the URL is correctly annotated on a content process crash.
- */
-add_task(function* test_content_url_annotation() {
-  let url = "https://example.com/browser/toolkit/content/tests/browser/file_redirect.html";
-  let redirect_url = "https://example.com/browser/toolkit/content/tests/browser/file_redirect_to.html";
-
-  yield BrowserTestUtils.withNewTab({
-    gBrowser: gBrowser
-  }, function* (browser) {
-    ok(browser.isRemoteBrowser, "Should be a remote browser");
-
-    // file_redirect.html should send us to file_redirect_to.html
-    let promise = ContentTask.spawn(browser, {}, function* () {
-      dump('ContentTask starting...\n');
-      yield new Promise((resolve) => {
-        addEventListener("RedirectDone", function listener() {
-          dump('Got RedirectDone\n');
-          removeEventListener("RedirectDone", listener);
-          resolve();
-        }, true, true);
-      });
-    });
-    browser.loadURI(url);
-    yield promise;
-
-    // Crash the tab
-    let annotations = yield BrowserTestUtils.crashBrowser(browser);
-
-    ok("URL" in annotations, "annotated a URL");
-    is(annotations.URL, redirect_url,
-       "Should have annotated the URL after redirect");
-  });
-});
diff --git a/toolkit/content/tests/browser/browser_crash_previous_frameloader.js b/toolkit/content/tests/browser/browser_crash_previous_frameloader.js
deleted file mode 100644
index bd50c6ffd..000000000
--- a/toolkit/content/tests/browser/browser_crash_previous_frameloader.js
+++ /dev/null
@@ -1,108 +0,0 @@
-"use strict";
-
-/**
- * Cleans up the .dmp and .extra file from a crash.
- *
- * @param subject (nsISupports)
- *        The subject passed through the ipc:content-shutdown
- *        observer notification when a content process crash has
- *        occurred.
- */
-function cleanUpMinidump(subject) {
-  Assert.ok(subject instanceof Ci.nsIPropertyBag2,
-            "Subject needs to be a nsIPropertyBag2 to clean up properly");
-  let dumpID = subject.getPropertyAsAString("dumpID");
-
-  Assert.ok(dumpID, "There should be a dumpID");
-  if (dumpID) {
-    let dir = Services.dirsvc.get("ProfD", Ci.nsIFile);
-    dir.append("minidumps");
-
-    let file = dir.clone();
-    file.append(dumpID + ".dmp");
-    file.remove(true);
-
-    file = dir.clone();
-    file.append(dumpID + ".extra");
-    file.remove(true);
-  }
-}
-
-/**
- * This test ensures that if a remote frameloader crashes after
- * the frameloader owner swaps it out for a new frameloader,
- * that a oop-browser-crashed event is not sent to the new
- * frameloader's browser element.
- */
-add_task(function* test_crash_in_previous_frameloader() {
-  // On debug builds, crashing tabs results in much thinking, which
-  // slows down the test and results in intermittent test timeouts,
-  // so we'll pump up the expected timeout for this test.
-  requestLongerTimeout(2);
-
-  if (!gMultiProcessBrowser) {
-    Assert.ok(false, "This test should only be run in multi-process mode.");
-    return;
-  }
-
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "http://example.com",
-  }, function*(browser) {
-    // First, sanity check...
-    Assert.ok(browser.isRemoteBrowser,
-              "This browser needs to be remote if this test is going to " +
-              "work properly.");
-
-    // We will wait for the oop-browser-crashed event to have
-    // a chance to appear. That event is fired when TabParents
-    // are destroyed, and that occurs _before_ ContentParents
-    // are destroyed, so we'll wait on the ipc:content-shutdown
-    // observer notification, which is fired when a ContentParent
-    // goes away. After we see this notification, oop-browser-crashed
-    // events should have fired.
-    let contentProcessGone = TestUtils.topicObserved("ipc:content-shutdown");
-    let sawTabCrashed = false;
-    let onTabCrashed = () => {
-      sawTabCrashed = true;
-    };
-
-    browser.addEventListener("oop-browser-crashed", onTabCrashed);
-
-    // The name of the game is to cause a crash in a remote browser,
-    // and then immediately swap out the browser for a non-remote one.
-    yield ContentTask.spawn(browser, null, function() {
-      const Cu = Components.utils;
-      Cu.import("resource://gre/modules/ctypes.jsm");
-      Cu.import("resource://gre/modules/Timer.jsm");
-
-      let dies = function() {
-        privateNoteIntentionalCrash();
-        let zero = new ctypes.intptr_t(8);
-        let badptr = ctypes.cast(zero, ctypes.PointerType(ctypes.int32_t));
-        badptr.contents
-      };
-
-      // When the parent flips the remoteness of the browser, the
-      // page should receive the pagehide event, which we'll then
-      // use to crash the frameloader.
-      addEventListener("pagehide", function() {
-        dump("\nEt tu, Brute?\n");
-        dies();
-      });
-    });
-
-    gBrowser.updateBrowserRemoteness(browser, false);
-    info("Waiting for content process to go away.");
-    let [subject, data] = yield contentProcessGone;
-
-    // If we don't clean up the minidump, the harness will
-    // complain.
-    cleanUpMinidump(subject);
-
-    info("Content process is gone!");
-    Assert.ok(!sawTabCrashed,
-              "Should not have seen the oop-browser-crashed event.");
-    browser.removeEventListener("oop-browser-crashed", onTabCrashed);
-  });
-});
diff --git a/toolkit/content/tests/browser/browser_datetime_datepicker.js b/toolkit/content/tests/browser/browser_datetime_datepicker.js
deleted file mode 100644
index 966a74e7a..000000000
--- a/toolkit/content/tests/browser/browser_datetime_datepicker.js
+++ /dev/null
@@ -1,284 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-const MONTH_YEAR = ".month-year",
-      DAYS_VIEW = ".days-view",
-      BTN_PREV_MONTH = ".prev",
-      BTN_NEXT_MONTH = ".next";
-const DATE_FORMAT = new Intl.DateTimeFormat("en-US", { year: "numeric", month: "long", timeZone: "UTC" }).format;
-
-// Create a list of abbreviations for calendar class names
-const W = "weekend",
-      O = "outside",
-      S = "selection",
-      R = "out-of-range",
-      T = "today",
-      P = "off-step";
-
-// Calendar classlist for 2016-12. Used to verify the classNames are correct.
-const calendarClasslist_201612 = [
-  [W, O], [O], [O], [O], [],  [],  [W],
-  [W],    [],  [],  [],  [],  [],  [W],
-  [W],    [],  [],  [],  [S], [],  [W],
-  [W],    [],  [],  [],  [],  [],  [W],
-  [W],    [],  [],  [],  [],  [],  [W],
-  [W, O], [O], [O], [O], [O], [O], [W, O],
-];
-
-function getCalendarText() {
-  return helper.getChildren(DAYS_VIEW).map(child => child.textContent);
-}
-
-function getCalendarClassList() {
-  return helper.getChildren(DAYS_VIEW).map(child => Array.from(child.classList));
-}
-
-function mergeArrays(a, b) {
-  return a.map((classlist, index) => classlist.concat(b[index]));
-}
-
-let helper = new DateTimeTestHelper();
-
-registerCleanupFunction(() => {
-  helper.cleanup();
-});
-
-/**
- * Test that date picker opens to today's date when input field is blank
- */
-add_task(async function test_datepicker_today() {
-  const date = new Date();
-
-  await helper.openPicker("data:text/html, <input type='date'>");
-
-  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(date));
-
-  await helper.tearDown();
-});
-
-/**
- * Test that date picker opens to the correct month, with calendar days
- * displayed correctly, given a date value is set.
- */
-add_task(async function test_datepicker_open() {
-  const inputValue = "2016-12-15";
-
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
-
-  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(inputValue)));
-  Assert.deepEqual(
-    getCalendarText(),
-    [
-      "27", "28", "29", "30",  "1",  "2",  "3",
-       "4",  "5",  "6",  "7",  "8",  "9", "10",
-      "11", "12", "13", "14", "15", "16", "17",
-      "18", "19", "20", "21", "22", "23", "24",
-      "25", "26", "27", "28", "29", "30", "31",
-       "1",  "2",  "3",  "4",  "5",  "6",  "7",
-    ],
-    "2016-12",
-  );
-  Assert.deepEqual(
-    getCalendarClassList(),
-    calendarClasslist_201612,
-    "2016-12 classNames"
-  );
-
-  await helper.tearDown();
-});
-
-/**
- * When the prev month button is clicked, calendar should display the dates for
- * the previous month.
- */
-add_task(async function test_datepicker_prev_month_btn() {
-  const inputValue = "2016-12-15";
-  const prevMonth = "2016-11-01";
-
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
-  helper.click(helper.getElement(BTN_PREV_MONTH));
-
-  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(prevMonth)));
-  Assert.deepEqual(
-    getCalendarText(),
-    [
-      "30", "31",  "1",  "2",  "3",  "4",  "5",
-       "6",  "7",  "8",  "9", "10", "11", "12",
-      "13", "14", "15", "16", "17", "18", "19",
-      "20", "21", "22", "23", "24", "25", "26",
-      "27", "28", "29", "30",  "1",  "2",  "3",
-       "4",  "5",  "6",  "7",  "8",  "9", "10",
-    ],
-    "2016-11",
-  );
-
-  await helper.tearDown();
-});
-
-/**
- * When the next month button is clicked, calendar should display the dates for
- * the next month.
- */
-add_task(async function test_datepicker_next_month_btn() {
-  const inputValue = "2016-12-15";
-  const nextMonth = "2017-01-01";
-
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
-  helper.click(helper.getElement(BTN_NEXT_MONTH));
-
-  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(nextMonth)));
-  Assert.deepEqual(
-    getCalendarText(),
-    [
-      "25", "26", "27", "28", "29", "30", "31",
-       "1",  "2",  "3",  "4",  "5",  "6",  "7",
-       "8",  "9", "10", "11", "12", "13", "14",
-      "15", "16", "17", "18", "19", "20", "21",
-      "22", "23", "24", "25", "26", "27", "28",
-      "29", "30", "31",  "1",  "2",  "3",  "4",
-    ],
-    "2017-01",
-  );
-
-  await helper.tearDown();
-});
-
-/**
- * When a date on the calendar is clicked, date picker should close and set
- * value to the input box.
- */
-add_task(async function test_datepicker_clicked() {
-  const inputValue = "2016-12-15";
-  const firstDayOnCalendar = "2016-11-27";
-
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
-  // Click the first item (top-left corner) of the calendar
-  helper.click(helper.getElement(DAYS_VIEW).children[0]);
-  await ContentTask.spawn(helper.tab.linkedBrowser, {}, async function() {
-    let inputEl = content.document.querySelector("input");
-    await ContentTaskUtils.waitForEvent(inputEl, "input");
-  });
-
-  Assert.equal(content.document.querySelector("input").value, firstDayOnCalendar);
-
-  await helper.tearDown();
-});
-
-/**
- * Make sure picker is in correct state when it is reopened.
- */
-add_task(async function test_datepicker_reopen_state() {
-  const inputValue = "2016-12-15";
-  const nextMonth = "2017-01-01";
-
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
-  // Navigate to the next month but does not commit the change
-  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(inputValue)));
-  helper.click(helper.getElement(BTN_NEXT_MONTH));
-  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(nextMonth)));
-  EventUtils.synthesizeKey("VK_ESCAPE", {}, window);
-
-  // Ensures the picker opens to the month of the input value
-  await BrowserTestUtils.synthesizeMouseAtCenter("input", {}, gBrowser.selectedBrowser);
-  await helper.waitForPickerReady();
-  Assert.equal(helper.getElement(MONTH_YEAR).textContent, DATE_FORMAT(new Date(inputValue)));
-
-  await helper.tearDown();
-});
-
-/**
- * When min and max attributes are set, calendar should show some dates as
- * out-of-range.
- */
-add_task(async function test_datepicker_min_max() {
-  const inputValue = "2016-12-15";
-  const inputMin = "2016-12-05";
-  const inputMax = "2016-12-25";
-
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}" min="${inputMin}" max="${inputMax}">`);
-
-  Assert.deepEqual(
-    getCalendarClassList(),
-    mergeArrays(calendarClasslist_201612, [
-      // R denotes out-of-range
-      [R], [R], [R], [R], [R], [R], [R],
-      [R], [],  [],  [],  [],  [],  [],
-      [],  [],  [],  [],  [],  [],  [],
-      [],  [],  [],  [],  [],  [],  [],
-      [],  [R], [R], [R], [R], [R], [R],
-      [R], [R], [R], [R], [R], [R], [R],
-    ]),
-    "2016-12 with min & max",
-  );
-
-  await helper.tearDown();
-});
-
-/**
- * When step attribute is set, calendar should show some dates as off-step.
- */
-add_task(async function test_datepicker_step() {
-  const inputValue = "2016-12-15";
-  const inputStep = "5";
-
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}" step="${inputStep}">`);
-
-  Assert.deepEqual(
-    getCalendarClassList(),
-    mergeArrays(calendarClasslist_201612, [
-      // P denotes off-step
-      [P], [P], [P], [],  [P], [P], [P],
-      [P], [],  [P], [P], [P], [P], [],
-      [P], [P], [P], [P], [],  [P], [P],
-      [P], [P], [],  [P], [P], [P], [P],
-      [],  [P], [P], [P], [P], [],  [P],
-      [P], [P], [P], [],  [P], [P], [P],
-    ]),
-    "2016-12 with step",
-  );
-
-  await helper.tearDown();
-});
-
-add_task(async function test_datepicker_abs_min() {
-  const inputValue = "0001-01-01";
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
-
-  Assert.deepEqual(
-    getCalendarText(),
-    [
-      "",   "1",  "2",  "3",  "4",  "5",  "6",
-      "7",  "8",  "9",  "10", "11", "12", "13",
-      "14", "15", "16", "17", "18", "19", "20",
-      "21", "22", "23", "24", "25", "26", "27",
-      "28", "29", "30", "31", "1",  "2",  "3",
-      "4",  "5",  "6",  "7",  "8",  "9",  "10",
-    ],
-    "0001-01",
-  );
-
-  await helper.tearDown();
-});
-
-add_task(async function test_datepicker_abs_max() {
-  const inputValue = "275760-09-13";
-  await helper.openPicker(`data:text/html, <input type="date" value="${inputValue}">`);
-
-  Assert.deepEqual(
-    getCalendarText(),
-    [
-      "31", "1", "2", "3",  "4",  "5",  "6",
-      "7",  "8", "9", "10", "11", "12", "13",
-      "",   "",  "",  "",   "",   "",   "",
-      "",   "",  "",  "",   "",   "",   "",
-      "",   "",  "",  "",   "",   "",   "",
-      "",   "",  "",  "",   "",   "",   "",
-    ],
-    "275760-09",
-  );
-
-  await helper.tearDown();
-});
diff --git a/toolkit/content/tests/browser/browser_default_image_filename.js b/toolkit/content/tests/browser/browser_default_image_filename.js
deleted file mode 100644
index 2859d486f..000000000
--- a/toolkit/content/tests/browser/browser_default_image_filename.js
+++ /dev/null
@@ -1,45 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-var MockFilePicker = SpecialPowers.MockFilePicker;
-MockFilePicker.init(window);
-
-/**
- * TestCase for bug 564387
- * <https://bugzilla.mozilla.org/show_bug.cgi?id=564387>
- */
-add_task(function* () {
-  let loadPromise = BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
-  gBrowser.loadURI("data:image/gif;base64,R0lGODlhEAAOALMAAOazToeHh0tLS/7LZv/0jvb29t/f3//Ub//ge8WSLf/rhf/3kdbW1mxsbP//mf///yH5BAAAAAAALAAAAAAQAA4AAARe8L1Ekyky67QZ1hLnjM5UUde0ECwLJoExKcppV0aCcGCmTIHEIUEqjgaORCMxIC6e0CcguWw6aFjsVMkkIr7g77ZKPJjPZqIyd7sJAgVGoEGv2xsBxqNgYPj/gAwXEQA7");
-  yield loadPromise;
-
-  let popupShownPromise = BrowserTestUtils.waitForEvent(document, "popupshown");
-
-  yield BrowserTestUtils.synthesizeMouseAtCenter("img",
-                                                 { type: "contextmenu", button: 2 },
-                                                 gBrowser.selectedBrowser);
-
-  yield popupShownPromise;
-
-  let showFilePickerPromise = new Promise(resolve => {
-    MockFilePicker.showCallback = function(fp) {
-      is(fp.defaultString, "index.gif");
-      resolve();
-    }
-  });
-
-  registerCleanupFunction(function () {
-    MockFilePicker.cleanup();
-  });
-
-  // Select "Save Image As" option from context menu
-  var saveImageAsCommand = document.getElementById("context-saveimage");
-  saveImageAsCommand.doCommand();
-
-  yield showFilePickerPromise;
-
-  let contextMenu = document.getElementById("contentAreaContextMenu");
-  let popupHiddenPromise = BrowserTestUtils.waitForEvent(contextMenu, "popuphidden");
-  contextMenu.hidePopup();
-  yield popupHiddenPromise;
-});
diff --git a/toolkit/content/tests/browser/browser_f7_caret_browsing.js b/toolkit/content/tests/browser/browser_f7_caret_browsing.js
deleted file mode 100644
index c4b6823d4..000000000
--- a/toolkit/content/tests/browser/browser_f7_caret_browsing.js
+++ /dev/null
@@ -1,227 +0,0 @@
-var gListener = null;
-const kURL = "data:text/html;charset=utf-8,Caret browsing is fun.<input id='in'>";
-
-const kPrefShortcutEnabled = "accessibility.browsewithcaret_shortcut.enabled";
-const kPrefWarnOnEnable    = "accessibility.warn_on_browsewithcaret";
-const kPrefCaretBrowsingOn = "accessibility.browsewithcaret";
-
-var oldPrefs = {};
-for (let pref of [kPrefShortcutEnabled, kPrefWarnOnEnable, kPrefCaretBrowsingOn]) {
-  oldPrefs[pref] = Services.prefs.getBoolPref(pref);
-}
-
-Services.prefs.setBoolPref(kPrefShortcutEnabled, true);
-Services.prefs.setBoolPref(kPrefWarnOnEnable, true);
-Services.prefs.setBoolPref(kPrefCaretBrowsingOn, false);
-
-registerCleanupFunction(function() {
-  for (let pref of [kPrefShortcutEnabled, kPrefWarnOnEnable, kPrefCaretBrowsingOn]) {
-    Services.prefs.setBoolPref(pref, oldPrefs[pref]);
-  }
-});
-
-// NB: not using BrowserTestUtils.domWindowOpened here because there's no way to
-// undo waiting for a window open. If we don't want the window to be opened, and
-// wait for it to verify that it indeed does not open, we need to be able to
-// then "stop" waiting so that when we next *do* want it to open, our "old"
-// listener doesn't fire and do things we don't want (like close the window...).
-let gCaretPromptOpeningObserver;
-function promiseCaretPromptOpened() {
-  return new Promise(resolve => {
-    function observer(subject, topic, data) {
-      if (topic == "domwindowopened") {
-        Services.ww.unregisterNotification(observer);
-        let win = subject.QueryInterface(Ci.nsIDOMWindow);
-        BrowserTestUtils.waitForEvent(win, "load", false, e => e.target.location.href != "about:blank").then(() => resolve(win));
-        gCaretPromptOpeningObserver = null;
-      }
-    }
-    Services.ww.registerNotification(observer);
-    gCaretPromptOpeningObserver = observer;
-  });
-}
-
-function hitF7(async = true) {
-  let f7 = () => EventUtils.sendKey("F7");
-  // Need to not stop execution inside this task:
-  if (async) {
-    executeSoon(f7);
-  } else {
-    f7();
-  }
-}
-
-function syncToggleCaretNoDialog(expected) {
-  let openedDialog = false;
-  promiseCaretPromptOpened().then(function(win) {
-    openedDialog = true;
-    win.close(); // This will eventually return focus here and allow the test to continue...
-  });
-  // Cause the dialog to appear sync, if it still does.
-  hitF7(false);
-
-  let expectedStr = expected ? "on." : "off.";
-  ok(!openedDialog, "Shouldn't open a dialog to turn caret browsing " + expectedStr);
-  // Need to clean up if the dialog wasn't opened, so the observer doesn't get
-  // re-triggered later on causing "issues".
-  if (!openedDialog) {
-    Services.ww.unregisterNotification(gCaretPromptOpeningObserver);
-    gCaretPromptOpeningObserver = null;
-  }
-  let prefVal = Services.prefs.getBoolPref(kPrefCaretBrowsingOn);
-  is(prefVal, expected, "Caret browsing should now be " + expectedStr);
-}
-
-function waitForFocusOnInput(browser)
-{
-  return ContentTask.spawn(browser, null, function* () {
-    let textEl = content.document.getElementById("in");
-    return ContentTaskUtils.waitForCondition(() => {
-      return content.document.activeElement == textEl;
-    }, "Input should get focused.");
-  });
-}
-
-function focusInput(browser)
-{
-  return ContentTask.spawn(browser, null, function* () {
-    let textEl = content.document.getElementById("in");
-    textEl.focus();
-  });
-}
-
-add_task(function* checkTogglingCaretBrowsing() {
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, kURL);
-  yield focusInput(tab.linkedBrowser);
-
-  let promiseGotKey = promiseCaretPromptOpened();
-  hitF7();
-  let prompt = yield promiseGotKey;
-  let doc = prompt.document;
-  is(doc.documentElement.defaultButton, "cancel", "No button should be the default");
-  ok(!doc.getElementById("checkbox").checked, "Checkbox shouldn't be checked by default.");
-  let promiseDialogUnloaded = BrowserTestUtils.waitForEvent(prompt, "unload");
-
-  doc.documentElement.cancelDialog();
-  yield promiseDialogUnloaded;
-  info("Dialog unloaded");
-  yield waitForFocusOnInput(tab.linkedBrowser);
-  ok(!Services.prefs.getBoolPref(kPrefCaretBrowsingOn), "Caret browsing should still be off after cancelling the dialog.");
-
-  promiseGotKey = promiseCaretPromptOpened();
-  hitF7();
-  prompt = yield promiseGotKey;
-
-  doc = prompt.document;
-  is(doc.documentElement.defaultButton, "cancel", "No button should be the default");
-  ok(!doc.getElementById("checkbox").checked, "Checkbox shouldn't be checked by default.");
-  promiseDialogUnloaded = BrowserTestUtils.waitForEvent(prompt, "unload");
-
-  doc.documentElement.acceptDialog();
-  yield promiseDialogUnloaded;
-  info("Dialog unloaded");
-  yield waitForFocusOnInput(tab.linkedBrowser);
-  ok(Services.prefs.getBoolPref(kPrefCaretBrowsingOn), "Caret browsing should be on after accepting the dialog.");
-
-  syncToggleCaretNoDialog(false);
-
-  promiseGotKey = promiseCaretPromptOpened();
-  hitF7();
-  prompt = yield promiseGotKey;
-  doc = prompt.document;
-
-  is(doc.documentElement.defaultButton, "cancel", "No button should be the default");
-  ok(!doc.getElementById("checkbox").checked, "Checkbox shouldn't be checked by default.");
-
-  promiseDialogUnloaded = BrowserTestUtils.waitForEvent(prompt, "unload");
-  doc.documentElement.cancelDialog();
-  yield promiseDialogUnloaded;
-  info("Dialog unloaded");
-  yield waitForFocusOnInput(tab.linkedBrowser);
-
-  ok(!Services.prefs.getBoolPref(kPrefCaretBrowsingOn), "Caret browsing should still be off after cancelling the dialog.");
-
-  Services.prefs.setBoolPref(kPrefShortcutEnabled, true);
-  Services.prefs.setBoolPref(kPrefWarnOnEnable, true);
-  Services.prefs.setBoolPref(kPrefCaretBrowsingOn, false);
-
-  yield BrowserTestUtils.removeTab(tab);
-});
-
-add_task(function* toggleCheckboxNoCaretBrowsing() {
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, kURL);
-  yield focusInput(tab.linkedBrowser);
-
-  let promiseGotKey = promiseCaretPromptOpened();
-  hitF7();
-  let prompt = yield promiseGotKey;
-  let doc = prompt.document;
-  is(doc.documentElement.defaultButton, "cancel", "No button should be the default");
-  let checkbox = doc.getElementById("checkbox");
-  ok(!checkbox.checked, "Checkbox shouldn't be checked by default.");
-
-  // Check the box:
-  checkbox.click();
-
-  let promiseDialogUnloaded = BrowserTestUtils.waitForEvent(prompt, "unload");
-
-  // Say no:
-  doc.documentElement.getButton("cancel").click();
-
-  yield promiseDialogUnloaded;
-  info("Dialog unloaded");
-  yield waitForFocusOnInput(tab.linkedBrowser);
-  ok(!Services.prefs.getBoolPref(kPrefCaretBrowsingOn), "Caret browsing should still be off.");
-  ok(!Services.prefs.getBoolPref(kPrefShortcutEnabled), "Shortcut should now be disabled.");
-
-  syncToggleCaretNoDialog(false);
-  ok(!Services.prefs.getBoolPref(kPrefShortcutEnabled), "Shortcut should still be disabled.");
-
-  Services.prefs.setBoolPref(kPrefShortcutEnabled, true);
-  Services.prefs.setBoolPref(kPrefWarnOnEnable, true);
-  Services.prefs.setBoolPref(kPrefCaretBrowsingOn, false);
-
-  yield BrowserTestUtils.removeTab(tab);
-});
-
-
-add_task(function* toggleCheckboxWantCaretBrowsing() {
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, kURL);
-  yield focusInput(tab.linkedBrowser);
-
-  let promiseGotKey = promiseCaretPromptOpened();
-  hitF7();
-  let prompt = yield promiseGotKey;
-  let doc = prompt.document;
-  is(doc.documentElement.defaultButton, "cancel", "No button should be the default");
-  let checkbox = doc.getElementById("checkbox");
-  ok(!checkbox.checked, "Checkbox shouldn't be checked by default.");
-
-  // Check the box:
-  checkbox.click();
-
-  let promiseDialogUnloaded = BrowserTestUtils.waitForEvent(prompt, "unload");
-
-  // Say yes:
-  doc.documentElement.acceptDialog();
-  yield promiseDialogUnloaded;
-  info("Dialog unloaded");
-  yield waitForFocusOnInput(tab.linkedBrowser);
-  ok(Services.prefs.getBoolPref(kPrefCaretBrowsingOn), "Caret browsing should now be on.");
-  ok(Services.prefs.getBoolPref(kPrefShortcutEnabled), "Shortcut should still be enabled.");
-  ok(!Services.prefs.getBoolPref(kPrefWarnOnEnable), "Should no longer warn when enabling.");
-
-  syncToggleCaretNoDialog(false);
-  syncToggleCaretNoDialog(true);
-  syncToggleCaretNoDialog(false);
-
-  Services.prefs.setBoolPref(kPrefShortcutEnabled, true);
-  Services.prefs.setBoolPref(kPrefWarnOnEnable, true);
-  Services.prefs.setBoolPref(kPrefCaretBrowsingOn, false);
-
-  yield BrowserTestUtils.removeTab(tab);
-});
-
-
-
-
diff --git a/toolkit/content/tests/browser/browser_findbar.js b/toolkit/content/tests/browser/browser_findbar.js
deleted file mode 100644
index 1ab06f632..000000000
--- a/toolkit/content/tests/browser/browser_findbar.js
+++ /dev/null
@@ -1,249 +0,0 @@
-XPCOMUtils.defineLazyModuleGetter(this, "Promise",
-  "resource://gre/modules/Promise.jsm");
-Components.utils.import("resource://gre/modules/Timer.jsm", this);
-
-const TEST_PAGE_URI = "data:text/html;charset=utf-8,The letter s.";
-// Using 'javascript' schema to bypass E10SUtils.canLoadURIInProcess, because
-// it does not allow 'data:' URI to be loaded in the parent process.
-const E10S_PARENT_TEST_PAGE_URI = "javascript:document.write('The letter s.');";
-
-/**
- * Makes sure that the findbar hotkeys (' and /) event listeners
- * are added to the system event group and do not get blocked
- * by calling stopPropagation on a keypress event on a page.
- */
-add_task(function* test_hotkey_event_propagation() {
-  info("Ensure hotkeys are not affected by stopPropagation.");
-
-  // Opening new tab
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE_URI);
-  let browser = gBrowser.getBrowserForTab(tab);
-  let findbar = gBrowser.getFindBar();
-
-  // Pressing these keys open the findbar.
-  const HOTKEYS = ["/", "'"];
-
-  // Checking if findbar appears when any hotkey is pressed.
-  for (let key of HOTKEYS) {
-    is(findbar.hidden, true, "Findbar is hidden now.");
-    gBrowser.selectedTab = tab;
-    yield SimpleTest.promiseFocus(gBrowser.selectedBrowser);
-    yield BrowserTestUtils.sendChar(key, browser);
-    is(findbar.hidden, false, "Findbar should not be hidden.");
-    yield closeFindbarAndWait(findbar);
-  }
-
-  // Stop propagation for all keyboard events.
-  let frameScript = () => {
-    const stopPropagation = e => e.stopImmediatePropagation();
-    let window = content.document.defaultView;
-    window.removeEventListener("keydown", stopPropagation);
-    window.removeEventListener("keypress", stopPropagation);
-    window.removeEventListener("keyup", stopPropagation);
-  };
-
-  let mm = browser.messageManager;
-  mm.loadFrameScript("data:,(" + frameScript.toString() + ")();", false);
-
-  // Checking if findbar still appears when any hotkey is pressed.
-  for (let key of HOTKEYS) {
-    is(findbar.hidden, true, "Findbar is hidden now.");
-    gBrowser.selectedTab = tab;
-    yield SimpleTest.promiseFocus(gBrowser.selectedBrowser);
-    yield BrowserTestUtils.sendChar(key, browser);
-    is(findbar.hidden, false, "Findbar should not be hidden.");
-    yield closeFindbarAndWait(findbar);
-  }
-
-  gBrowser.removeTab(tab);
-});
-
-add_task(function* test_not_found() {
-  info("Check correct 'Phrase not found' on new tab");
-
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE_URI);
-
-  // Search for the first word.
-  yield promiseFindFinished("--- THIS SHOULD NEVER MATCH ---", false);
-  let findbar = gBrowser.getFindBar();
-  is(findbar._findStatusDesc.textContent, findbar._notFoundStr,
-     "Findbar status text should be 'Phrase not found'");
-
-  gBrowser.removeTab(tab);
-});
-
-add_task(function* test_found() {
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE_URI);
-
-  // Search for a string that WILL be found, with 'Highlight All' on
-  yield promiseFindFinished("S", true);
-  ok(!gBrowser.getFindBar()._findStatusDesc.textContent,
-     "Findbar status should be empty");
-
-  gBrowser.removeTab(tab);
-});
-
-// Setting first findbar to case-sensitive mode should not affect
-// new tab find bar.
-add_task(function* test_tabwise_case_sensitive() {
-  let tab1 = yield BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE_URI);
-  let findbar1 = gBrowser.getFindBar();
-
-  let tab2 = yield BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE_URI);
-  let findbar2 = gBrowser.getFindBar();
-
-  // Toggle case sensitivity for first findbar
-  findbar1.getElement("find-case-sensitive").click();
-
-  gBrowser.selectedTab = tab1;
-
-  // Not found for first tab.
-  yield promiseFindFinished("S", true);
-  is(findbar1._findStatusDesc.textContent, findbar1._notFoundStr,
-     "Findbar status text should be 'Phrase not found'");
-
-  gBrowser.selectedTab = tab2;
-
-  // But it didn't affect the second findbar.
-  yield promiseFindFinished("S", true);
-  ok(!findbar2._findStatusDesc.textContent, "Findbar status should be empty");
-
-  gBrowser.removeTab(tab1);
-  gBrowser.removeTab(tab2);
-});
-
-/**
- * Navigating from a web page (for example mozilla.org) to an internal page
- * (like about:addons) might trigger a change of browser's remoteness.
- * 'Remoteness change' means that rendering page content moves from child
- * process into the parent process or the other way around.
- * This test ensures that findbar properly handles such a change.
- */
-add_task(function* test_reinitialization_at_remoteness_change() {
-  // This test only makes sence in e10s evironment.
-  if (!gMultiProcessBrowser) {
-    info("Skipping this test because of non-e10s environment.");
-    return;
-  }
-
-  info("Ensure findbar re-initialization at remoteness change.");
-
-  // Load a remote page and trigger findbar construction.
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE_URI);
-  let browser = gBrowser.getBrowserForTab(tab);
-  let findbar = gBrowser.getFindBar();
-
-  // Findbar should operate normally.
-  yield promiseFindFinished("z", false);
-  is(findbar._findStatusDesc.textContent, findbar._notFoundStr,
-     "Findbar status text should be 'Phrase not found'");
-
-  yield promiseFindFinished("s", false);
-  ok(!findbar._findStatusDesc.textContent, "Findbar status should be empty");
-
-  // Moving browser into the parent process and reloading sample data.
-  ok(browser.isRemoteBrowser, "Browser should be remote now.");
-  yield promiseRemotenessChange(tab, false);
-  yield BrowserTestUtils.loadURI(browser, E10S_PARENT_TEST_PAGE_URI);
-  ok(!browser.isRemoteBrowser, "Browser should not be remote any more.");
-
-  // Findbar should keep operating normally after remoteness change.
-  yield promiseFindFinished("z", false);
-  is(findbar._findStatusDesc.textContent, findbar._notFoundStr,
-     "Findbar status text should be 'Phrase not found'");
-
-  yield promiseFindFinished("s", false);
-  ok(!findbar._findStatusDesc.textContent, "Findbar status should be empty");
-
-  yield BrowserTestUtils.removeTab(tab);
-});
-
-/**
- * Ensure that the initial typed characters aren't lost immediately after
- * opening the find bar.
- */
-add_task(function* () {
-  // This test only makes sence in e10s evironment.
-  if (!gMultiProcessBrowser) {
-    info("Skipping this test because of non-e10s environment.");
-    return;
-  }
-
-  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_PAGE_URI);
-  let browser = tab.linkedBrowser;
-
-  ok(!gFindBarInitialized, "findbar isn't initialized yet");
-
-  let findBar = gFindBar;
-  let initialValue = findBar._findField.value;
-
-  EventUtils.synthesizeKey("f", { accelKey: true }, window);
-
-  let promises = [
-    BrowserTestUtils.sendChar("a", browser),
-    BrowserTestUtils.sendChar("b", browser),
-    BrowserTestUtils.sendChar("c", browser)
-  ];
-
-  isnot(document.activeElement, findBar._findField.inputField,
-    "findbar is not yet focused");
-  is(findBar._findField.value, initialValue, "still has initial find query");
-
-  yield Promise.all(promises);
-  is(document.activeElement, findBar._findField.inputField,
-    "findbar is now focused");
-  is(findBar._findField.value, "abc", "abc fully entered as find query");
-
-  yield BrowserTestUtils.removeTab(tab);
-});
-
-function promiseFindFinished(searchText, highlightOn) {
-  let deferred = Promise.defer();
-
-  let findbar = gBrowser.getFindBar();
-  findbar.startFind(findbar.FIND_NORMAL);
-  let highlightElement = findbar.getElement("highlight");
-  if (highlightElement.checked != highlightOn)
-    highlightElement.click();
-  executeSoon(() => {
-    findbar._findField.value = searchText;
-
-    let resultListener;
-    // When highlighting is on the finder sends a second "FOUND" message after
-    // the search wraps. This causes timing problems with e10s. waitMore
-    // forces foundOrTimeout wait for the second "FOUND" message before
-    // resolving the promise.
-    let waitMore = highlightOn;
-    let findTimeout = setTimeout(() => foundOrTimedout(null), 2000);
-    let foundOrTimedout = function(aData) {
-      if (aData !== null && waitMore) {
-        waitMore = false;
-        return;
-      }
-      if (aData === null)
-        info("Result listener not called, timeout reached.");
-      clearTimeout(findTimeout);
-      findbar.browser.finder.removeResultListener(resultListener);
-      deferred.resolve();
-    }
-
-    resultListener = {
-      onFindResult: foundOrTimedout
-    };
-    findbar.browser.finder.addResultListener(resultListener);
-    findbar._find();
-  });
-
-  return deferred.promise;
-}
-
-function promiseRemotenessChange(tab, shouldBeRemote) {
-  return new Promise((resolve) => {
-    let browser = gBrowser.getBrowserForTab(tab);
-    tab.addEventListener("TabRemotenessChange", function listener() {
-      tab.removeEventListener("TabRemotenessChange", listener);
-      resolve();
-    });
-    gBrowser.updateBrowserRemoteness(browser, shouldBeRemote);
-  });
-}
diff --git a/toolkit/content/tests/browser/browser_isSynthetic.js b/toolkit/content/tests/browser/browser_isSynthetic.js
deleted file mode 100644
index 15a341461..000000000
--- a/toolkit/content/tests/browser/browser_isSynthetic.js
+++ /dev/null
@@ -1,72 +0,0 @@
-function LocationChangeListener(browser) {
-  this.browser = browser;
-  browser.addProgressListener(this);
-}
-
-LocationChangeListener.prototype = {
-  wasSynthetic: false,
-  browser: null,
-
-  destroy: function() {
-    this.browser.removeProgressListener(this);
-  },
-
-  onLocationChange: function(webProgress, request, location, flags) {
-    this.wasSynthetic = this.browser.isSyntheticDocument;
-  },
-
-  QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
-                                         Ci.nsISupportsWeakReference])
-}
-
-const FILES = gTestPath.replace("browser_isSynthetic.js", "")
-                       .replace("chrome://mochitests/content/", "http://example.com/");
-
-function waitForPageShow(browser) {
-  return ContentTask.spawn(browser, null, function*() {
-    Cu.import("resource://gre/modules/PromiseUtils.jsm");
-    yield new Promise(resolve => {
-      let listener = () => {
-        removeEventListener("pageshow", listener, true);
-        resolve();
-      }
-      addEventListener("pageshow", listener, true);
-    });
-  });
-}
-
-add_task(function*() {
-  let tab = gBrowser.addTab("about:blank");
-  let browser = tab.linkedBrowser;
-  yield BrowserTestUtils.browserLoaded(browser);
-  let listener = new LocationChangeListener(browser);
-
-  is(browser.isSyntheticDocument, false, "Should not be synthetic");
-
-  let loadPromise = waitForPageShow(browser);
-  browser.loadURI("data:text/html;charset=utf-8,<html/>");
-  yield loadPromise;
-  is(listener.wasSynthetic, false, "Should not be synthetic");
-  is(browser.isSyntheticDocument, false, "Should not be synthetic");
-
-  loadPromise = waitForPageShow(browser);
-  browser.loadURI(FILES + "empty.png");
-  yield loadPromise;
-  is(listener.wasSynthetic, true, "Should be synthetic");
-  is(browser.isSyntheticDocument, true, "Should be synthetic");
-
-  loadPromise = waitForPageShow(browser);
-  browser.goBack();
-  yield loadPromise;
-  is(listener.wasSynthetic, false, "Should not be synthetic");
-  is(browser.isSyntheticDocument, false, "Should not be synthetic");
-
-  loadPromise = waitForPageShow(browser);
-  browser.goForward();
-  yield loadPromise;
-  is(listener.wasSynthetic, true, "Should be synthetic");
-  is(browser.isSyntheticDocument, true, "Should be synthetic");
-
-  listener.destroy();
-  gBrowser.removeTab(tab);
-});
diff --git a/toolkit/content/tests/browser/browser_keyevents_during_autoscrolling.js b/toolkit/content/tests/browser/browser_keyevents_during_autoscrolling.js
deleted file mode 100644
index 3fce47114..000000000
--- a/toolkit/content/tests/browser/browser_keyevents_during_autoscrolling.js
+++ /dev/null
@@ -1,120 +0,0 @@
-add_task(function * ()
-{
-  const kPrefName_AutoScroll = "general.autoScroll";
-  Services.prefs.setBoolPref(kPrefName_AutoScroll, true);
-
-  const kNoKeyEvents   = 0;
-  const kKeyDownEvent  = 1;
-  const kKeyPressEvent = 2;
-  const kKeyUpEvent    = 4;
-  const kAllKeyEvents  = 7;
-
-  var expectedKeyEvents;
-  var dispatchedKeyEvents;
-  var key;
-  var root;
-
-  /**
-   * Encapsulates EventUtils.sendChar().
-   */
-  function sendChar(aChar)
-  {
-    key = aChar;
-    dispatchedKeyEvents = kNoKeyEvents;
-    EventUtils.sendChar(key);
-    is(dispatchedKeyEvents, expectedKeyEvents,
-       "unexpected key events were dispatched or not dispatched: " + key);
-  }
-
-  /**
-   * Encapsulates EventUtils.sendKey().
-   */
-  function sendKey(aKey)
-  {
-    key = aKey;
-    dispatchedKeyEvents = kNoKeyEvents;
-    EventUtils.sendKey(key);
-    is(dispatchedKeyEvents, expectedKeyEvents,
-       "unexpected key events were dispatched or not dispatched: " + key);
-  }
-
-  function onKey(aEvent)
-  {
-//    if (aEvent.target != root && aEvent.target != root.ownerDocument.body) {
-//      ok(false, "unknown target: " + aEvent.target.tagName);
-//      return;
-//    }
-
-    var keyFlag;
-    switch (aEvent.type) {
-      case "keydown":
-        keyFlag = kKeyDownEvent;
-        break;
-      case "keypress":
-        keyFlag = kKeyPressEvent;
-        break;
-      case "keyup":
-        keyFlag = kKeyUpEvent;
-        break;
-      default:
-        ok(false, "Unknown events: " + aEvent.type);
-        return;
-    }
-    dispatchedKeyEvents |= keyFlag;
-    is(keyFlag, expectedKeyEvents & keyFlag, aEvent.type + " fired: " + key);
-  }
-
-  var dataUri = 'data:text/html,<body style="height:10000px;"></body>';
-
-  let loadedPromise = BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
-  gBrowser.loadURI(dataUri);
-  yield loadedPromise;
-
-  yield SimpleTest.promiseFocus(gBrowser.selectedBrowser);
-
-  window.addEventListener("keydown", onKey, false);
-  window.addEventListener("keypress", onKey, false);
-  window.addEventListener("keyup", onKey, false);
-
-  // Test whether the key events are handled correctly under normal condition
-  expectedKeyEvents = kAllKeyEvents;
-  sendChar("A");
-
-  // Start autoscrolling by middle button click on the page
-  let shownPromise = BrowserTestUtils.waitForEvent(window, "popupshown", false,
-                       event => event.originalTarget.className == "autoscroller");
-  yield BrowserTestUtils.synthesizeMouseAtPoint(10, 10, { button: 1 },
-                                                gBrowser.selectedBrowser);
-  yield shownPromise;
-
-  // Most key events should be eaten by the browser.
-  expectedKeyEvents = kNoKeyEvents;
-  sendChar("A");
-  sendKey("DOWN");
-  sendKey("RETURN");
-  sendKey("RETURN");
-  sendKey("HOME");
-  sendKey("END");
-  sendKey("TAB");
-  sendKey("RETURN");
-
-  // Finish autoscrolling by ESC key.  Note that only keydown and keypress
-  // events are eaten because keyup event is fired *after* the autoscrolling
-  // is finished.
-  expectedKeyEvents = kKeyUpEvent;
-  sendKey("ESCAPE");
-
-  // Test whether the key events are handled correctly under normal condition
-  expectedKeyEvents = kAllKeyEvents;
-  sendChar("A");
-
-  window.removeEventListener("keydown", onKey, false);
-  window.removeEventListener("keypress", onKey, false);
-  window.removeEventListener("keyup", onKey, false);
-
-  // restore the changed prefs
-  if (Services.prefs.prefHasUserValue(kPrefName_AutoScroll))
-    Services.prefs.clearUserPref(kPrefName_AutoScroll);
-
-  finish();
-});
diff --git a/toolkit/content/tests/browser/browser_label_textlink.js b/toolkit/content/tests/browser/browser_label_textlink.js
deleted file mode 100644
index 861086707..000000000
--- a/toolkit/content/tests/browser/browser_label_textlink.js
+++ /dev/null
@@ -1,38 +0,0 @@
-add_task(function* () {
-  yield BrowserTestUtils.withNewTab({gBrowser, url: "about:config"}, function*(browser) {
-    let newTabURL = "http://www.example.com/";
-    yield ContentTask.spawn(browser, newTabURL, function*(newTabURL) {
-      let doc = content.document;
-      let label = doc.createElement("label");
-      label.href = newTabURL;
-      label.id = "textlink-test";
-      label.className = "text-link";
-      label.textContent = "click me";
-      doc.documentElement.append(label);
-    });
-
-    // Test that click will open tab in foreground.
-    let awaitNewTab = BrowserTestUtils.waitForNewTab(gBrowser, newTabURL);
-    yield BrowserTestUtils.synthesizeMouseAtCenter("#textlink-test", {}, browser);
-    let newTab = yield awaitNewTab;
-    is(newTab.linkedBrowser, gBrowser.selectedBrowser, "selected tab should be example page");
-    yield BrowserTestUtils.removeTab(gBrowser.selectedTab);
-
-    // Test that ctrl+shift+click/meta+shift+click will open tab in background.
-    awaitNewTab = BrowserTestUtils.waitForNewTab(gBrowser, newTabURL);
-    yield BrowserTestUtils.synthesizeMouseAtCenter("#textlink-test",
-      {ctrlKey: true, metaKey: true, shiftKey: true},
-      browser);
-    yield awaitNewTab;
-    is(gBrowser.selectedBrowser, browser, "selected tab should be original tab");
-    yield BrowserTestUtils.removeTab(gBrowser.tabs[gBrowser.tabs.length - 1]);
-
-    // Middle-clicking should open tab in foreground.
-    awaitNewTab = BrowserTestUtils.waitForNewTab(gBrowser, newTabURL);
-    yield BrowserTestUtils.synthesizeMouseAtCenter("#textlink-test",
-      {button: 1}, browser);
-    newTab = yield awaitNewTab;
-    is(newTab.linkedBrowser, gBrowser.selectedBrowser, "selected tab should be example page");
-    yield BrowserTestUtils.removeTab(gBrowser.tabs[gBrowser.tabs.length - 1]);
-  });
-});
diff --git a/toolkit/content/tests/browser/browser_mediaPlayback.js b/toolkit/content/tests/browser/browser_mediaPlayback.js
deleted file mode 100644
index 1a6ebfcb8..000000000
--- a/toolkit/content/tests/browser/browser_mediaPlayback.js
+++ /dev/null
@@ -1,30 +0,0 @@
-const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_mediaPlayback.html";
-const FRAME = "https://example.com/browser/toolkit/content/tests/browser/file_mediaPlaybackFrame.html";
-
-function wait_for_event(browser, event) {
-  return BrowserTestUtils.waitForEvent(browser, event, false, (event) => {
-    is(event.originalTarget, browser, "Event must be dispatched to correct browser.");
-    ok(!event.cancelable, "The event should not be cancelable");
-    return true;
-  });
-}
-
-function* test_on_browser(url, browser) {
-  browser.loadURI(url);
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-  yield wait_for_event(browser, "DOMAudioPlaybackStopped");
-}
-
-add_task(function* test_page() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "about:blank",
-  }, test_on_browser.bind(undefined, PAGE));
-});
-
-add_task(function* test_frame() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "about:blank",
-  }, test_on_browser.bind(undefined, FRAME));
-});
diff --git a/toolkit/content/tests/browser/browser_mediaPlayback_mute.js b/toolkit/content/tests/browser/browser_mediaPlayback_mute.js
deleted file mode 100644
index 852fc56fb..000000000
--- a/toolkit/content/tests/browser/browser_mediaPlayback_mute.js
+++ /dev/null
@@ -1,104 +0,0 @@
-const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_mediaPlayback2.html";
-const FRAME = "https://example.com/browser/toolkit/content/tests/browser/file_mediaPlaybackFrame2.html";
-
-function wait_for_event(browser, event) {
-  return BrowserTestUtils.waitForEvent(browser, event, false, (event) => {
-    is(event.originalTarget, browser, "Event must be dispatched to correct browser.");
-    return true;
-  });
-}
-
-function* test_audio_in_browser() {
-  function get_audio_element() {
-    var doc = content.document;
-    var list = doc.getElementsByTagName('audio');
-    if (list.length == 1) {
-      return list[0];
-    }
-
-    // iframe?
-    list = doc.getElementsByTagName('iframe');
-
-    var iframe = list[0];
-    list = iframe.contentDocument.getElementsByTagName('audio');
-    return list[0];
-  }
-
-  var audio = get_audio_element();
-  return {
-    computedVolume: audio.computedVolume,
-    computedMuted: audio.computedMuted
-  }
-}
-
-function* test_on_browser(url, browser) {
-  browser.loadURI(url);
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  var result = yield ContentTask.spawn(browser, null, test_audio_in_browser);
-  is(result.computedVolume, 1, "Audio volume is 1");
-  is(result.computedMuted, false, "Audio is not muted");
-
-  ok(!browser.audioMuted, "Audio should not be muted by default");
-  browser.mute();
-  ok(browser.audioMuted, "Audio should be muted now");
-
-  yield wait_for_event(browser, "DOMAudioPlaybackStopped");
-
-  result = yield ContentTask.spawn(browser, null, test_audio_in_browser);
-  is(result.computedVolume, 0, "Audio volume is 0 when muted");
-  is(result.computedMuted, true, "Audio is muted");
-}
-
-function* test_visibility(url, browser) {
-  browser.loadURI(url);
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  var result = yield ContentTask.spawn(browser, null, test_audio_in_browser);
-  is(result.computedVolume, 1, "Audio volume is 1");
-  is(result.computedMuted, false, "Audio is not muted");
-
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "about:blank",
-  }, function() {});
-
-  ok(!browser.audioMuted, "Audio should not be muted by default");
-  browser.mute();
-  ok(browser.audioMuted, "Audio should be muted now");
-
-  yield wait_for_event(browser, "DOMAudioPlaybackStopped");
-
-  result = yield ContentTask.spawn(browser, null, test_audio_in_browser);
-  is(result.computedVolume, 0, "Audio volume is 0 when muted");
-  is(result.computedMuted, true, "Audio is muted");
-}
-
-add_task(function*() {
-  yield new Promise((resolve) => {
-    SpecialPowers.pushPrefEnv({"set": [
-      ["media.useAudioChannelService.testing", true]
-    ]}, resolve);
-  });
-});
-
-add_task(function* test_page() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "about:blank",
-  }, test_on_browser.bind(undefined, PAGE));
-});
-
-add_task(function* test_frame() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "about:blank",
-  }, test_on_browser.bind(undefined, FRAME));
-});
-
-add_task(function* test_frame() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: "about:blank",
-  }, test_visibility.bind(undefined, PAGE));
-});
diff --git a/toolkit/content/tests/browser/browser_mediaPlayback_suspended.js b/toolkit/content/tests/browser/browser_mediaPlayback_suspended.js
deleted file mode 100644
index ef8bb9dc8..000000000
--- a/toolkit/content/tests/browser/browser_mediaPlayback_suspended.js
+++ /dev/null
@@ -1,191 +0,0 @@
-const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_mediaPlayback2.html";
-
-var SuspendedType = {
-  NONE_SUSPENDED             : 0,
-  SUSPENDED_PAUSE            : 1,
-  SUSPENDED_BLOCK            : 2,
-  SUSPENDED_PAUSE_DISPOSABLE : 3
-};
-
-function wait_for_event(browser, event) {
-  return BrowserTestUtils.waitForEvent(browser, event, false, (event) => {
-    is(event.originalTarget, browser, "Event must be dispatched to correct browser.");
-    return true;
-  });
-}
-
-function check_audio_onplay() {
-  var list = content.document.getElementsByTagName('audio');
-  if (list.length != 1) {
-    ok(false, "There should be only one audio element in page!")
-  }
-
-  var audio = list[0];
-  return new Promise((resolve, reject) => {
-    audio.onplay = () => {
-      ok(needToReceiveOnPlay, "Should not receive play event!");
-      this.onplay = null;
-      reject();
-    };
-
-    audio.pause();
-    audio.play();
-
-    setTimeout(() => {
-      ok(true, "Doesn't receive play event when media was blocked.");
-      audio.onplay = null;
-      resolve();
-    }, 1000)
-  });
-}
-
-function check_audio_suspended(suspendedType) {
-  var list = content.document.getElementsByTagName('audio');
-  if (list.length != 1) {
-    ok(false, "There should be only one audio element in page!")
-  }
-
-  var audio = list[0];
-  is(audio.computedSuspended, suspendedType,
-     "The suspended state of MediaElement is correct.");
-}
-
-function check_audio_pause_state(expectedPauseState) {
-  var list = content.document.getElementsByTagName('audio');
-  if (list.length != 1) {
-    ok(false, "There should be only one audio element in page!")
-  }
-
-  var audio = list[0];
-  if (expectedPauseState) {
-    is(audio.paused, true, "Audio is paused correctly.");
-  } else {
-    is(audio.paused, false, "Audio is resumed correctly.");
-  }
-}
-
-function* suspended_pause(url, browser) {
-  info("### Start test for suspended-pause ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the suspended state of audio should be non-suspened -");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio_suspended);
-
-  info("- pause playing audio -");
-  browser.pauseMedia(false /* non-disposable */);
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE,
-                                   check_audio_suspended);
-
-  info("- resume paused audio -");
-  browser.resumeMedia();
-  yield ContentTask.spawn(browser, false /* expect for playing */,
-                                   check_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio_suspended);
-}
-
-function* suspended_pause_disposable(url, browser) {
-  info("### Start test for suspended-pause-disposable ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the suspended state of audio should be non-suspened -");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio_suspended);
-
-  info("- pause playing audio -");
-  browser.pauseMedia(true /* disposable */);
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE_DISPOSABLE,
-                                   check_audio_suspended);
-
-  info("- resume paused audio -");
-  browser.resumeMedia();
-  yield ContentTask.spawn(browser, false /* expect for playing */,
-                                   check_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio_suspended);
-}
-
-function* suspended_stop_disposable(url, browser) {
-  info("### Start test for suspended-stop-disposable ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the suspended state of audio should be non-suspened -");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio_suspended);
-
-  info("- stop playing audio -");
-  browser.stopMedia();
-  yield wait_for_event(browser, "DOMAudioPlaybackStopped");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio_suspended);
-}
-
-function* suspended_block(url, browser) {
-  info("### Start test for suspended-block ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- block playing audio -");
-  browser.blockMedia();
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_BLOCK,
-                                   check_audio_suspended);
-  yield ContentTask.spawn(browser, null,
-                                   check_audio_onplay);
-
-  info("- resume blocked audio -");
-  browser.resumeMedia();
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_audio_suspended);
-}
-
-add_task(function* setup_test_preference() {
-  yield new Promise(resolve => {
-    SpecialPowers.pushPrefEnv({"set": [
-      ["media.useAudioChannelService.testing", true]
-    ]}, resolve);
-  });
-});
-
-add_task(function* test_suspended_pause() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_pause.bind(this, PAGE));
-});
-
-add_task(function* test_suspended_pause_disposable() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_pause_disposable.bind(this, PAGE));
-});
-
-add_task(function* test_suspended_stop_disposable() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_stop_disposable.bind(this, PAGE));
-});
-
-add_task(function* test_suspended_block() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_block.bind(this, PAGE));
-});
diff --git a/toolkit/content/tests/browser/browser_mediaPlayback_suspended_multipleAudio.js b/toolkit/content/tests/browser/browser_mediaPlayback_suspended_multipleAudio.js
deleted file mode 100644
index 12e2ec077..000000000
--- a/toolkit/content/tests/browser/browser_mediaPlayback_suspended_multipleAudio.js
+++ /dev/null
@@ -1,311 +0,0 @@
-const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_multipleAudio.html";
-
-var SuspendedType = {
-  NONE_SUSPENDED             : 0,
-  SUSPENDED_PAUSE            : 1,
-  SUSPENDED_BLOCK            : 2,
-  SUSPENDED_PAUSE_DISPOSABLE : 3
-};
-
-function wait_for_event(browser, event) {
-  return BrowserTestUtils.waitForEvent(browser, event, false, (event) => {
-    is(event.originalTarget, browser, "Event must be dispatched to correct browser.");
-    return true;
-  });
-}
-
-function check_all_audio_suspended(suspendedType) {
-  var autoPlay = content.document.getElementById('autoplay');
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!autoPlay || !nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(autoPlay.computedSuspended, suspendedType,
-     "The suspeded state of autoplay audio is correct.");
-  is(nonAutoPlay.computedSuspended, suspendedType,
-     "The suspeded state of non-autoplay audio is correct.");
-}
-
-function check_autoplay_audio_suspended(suspendedType) {
-  var autoPlay = content.document.getElementById('autoplay');
-  if (!autoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(autoPlay.computedSuspended, suspendedType,
-     "The suspeded state of autoplay audio is correct.");
-}
-
-function check_nonautoplay_audio_suspended(suspendedType) {
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(nonAutoPlay.computedSuspended, suspendedType,
-     "The suspeded state of non-autoplay audio is correct.");
-}
-
-function check_autoplay_audio_pause_state(expectedPauseState) {
-  var autoPlay = content.document.getElementById('autoplay');
-  if (!autoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  if (autoPlay.paused == expectedPauseState) {
-    if (expectedPauseState) {
-      ok(true, "Audio is paused correctly.");
-    } else {
-      ok(true, "Audio is resumed correctly.");
-    }
-  } else if (expectedPauseState) {
-    autoPlay.onpause = function () {
-      autoPlay.onpause = null;
-      ok(true, "Audio is paused correctly, checking from onpause.");
-    }
-  } else {
-    autoPlay.onplay = function () {
-      autoPlay.onplay = null;
-      ok(true, "Audio is resumed correctly, checking from onplay.");
-    }
-  }
-}
-
-function play_nonautoplay_audio_should_be_paused() {
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  nonAutoPlay.play();
-  return new Promise(resolve => {
-    nonAutoPlay.onpause = function () {
-      nonAutoPlay.onpause = null;
-      is(nonAutoPlay.ended, false, "Audio can't be playback.");
-      resolve();
-    }
-  });
-}
-
-function all_audio_onresume() {
-  var autoPlay = content.document.getElementById('autoplay');
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!autoPlay || !nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(autoPlay.paused, false, "Autoplay audio is resumed.");
-  is(nonAutoPlay.paused, false, "Non-AutoPlay audio is resumed.");
-}
-
-function all_audio_onpause() {
-  var autoPlay = content.document.getElementById('autoplay');
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!autoPlay || !nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(autoPlay.paused, true, "Autoplay audio is paused.");
-  is(nonAutoPlay.paused, true, "Non-AutoPlay audio is paused.");
-}
-
-function play_nonautoplay_audio_should_play_until_ended() {
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  nonAutoPlay.play();
-  return new Promise(resolve => {
-    nonAutoPlay.onended = function () {
-      nonAutoPlay.onended = null;
-      ok(true, "Audio can be playback until ended.");
-      resolve();
-    }
-  });
-}
-
-function no_audio_resumed() {
-  var autoPlay = content.document.getElementById('autoplay');
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!autoPlay || !nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  is(autoPlay.paused && nonAutoPlay.paused, true, "No audio was resumed.");
-}
-
-function play_nonautoplay_audio_should_be_blocked(suspendedType) {
-  var nonAutoPlay = content.document.getElementById('nonautoplay');
-  if (!nonAutoPlay) {
-    ok(false, "Can't get the audio element!");
-  }
-
-  nonAutoPlay.play();
-  ok(nonAutoPlay.paused, "The blocked audio can't be playback.");
-}
-
-function* suspended_pause(url, browser) {
-  info("### Start test for suspended-pause ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the default suspended state of all audio should be non-suspened-");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-
-  info("- pause all audio in the page -");
-  browser.pauseMedia(false /* non-disposable */);
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_autoplay_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE,
-                                   check_autoplay_audio_suspended);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_nonautoplay_audio_suspended);
-
-  info("- no audio can be playback during suspended-paused -");
-  yield ContentTask.spawn(browser, null,
-                                   play_nonautoplay_audio_should_be_paused);
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE,
-                                   check_nonautoplay_audio_suspended);
-
-  info("- both audio should be resumed at the same time -");
-  browser.resumeMedia();
-  yield ContentTask.spawn(browser, null,
-                                   all_audio_onresume);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-
-  info("- both audio should be paused at the same time -");
-  browser.pauseMedia(false /* non-disposable */);
-  yield ContentTask.spawn(browser, null, all_audio_onpause);
-}
-
-function* suspended_pause_disposable(url, browser) {
-  info("### Start test for suspended-pause-disposable ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the default suspended state of all audio should be non-suspened -");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-
-  info("- only pause playing audio in the page -");
-  browser.pauseMedia(true /* non-disposable */);
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_autoplay_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_PAUSE_DISPOSABLE,
-                                   check_autoplay_audio_suspended);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_nonautoplay_audio_suspended);
-
-  info("- new playing audio should be playback correctly -");
-  yield ContentTask.spawn(browser, null,
-                                   play_nonautoplay_audio_should_play_until_ended);
-
-  info("- should only resume one audio -");
-  browser.resumeMedia();
-  yield ContentTask.spawn(browser, false /* expect for playing */,
-                                   check_autoplay_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-}
-
-function* suspended_stop_disposable(url, browser) {
-  info("### Start test for suspended-stop-disposable ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the default suspended state of all audio should be non-suspened -");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-
-  info("- only stop playing audio in the page -");
-  browser.stopMedia();
-  yield wait_for_event(browser, "DOMAudioPlaybackStopped");
-  yield ContentTask.spawn(browser, true /* expect for pause */,
-                                   check_autoplay_audio_pause_state);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-
-  info("- new playing audio should be playback correctly -");
-  yield ContentTask.spawn(browser, null,
-                                   play_nonautoplay_audio_should_play_until_ended);
-
-  info("- no any audio can be resumed by page -");
-  browser.resumeMedia();
-  yield ContentTask.spawn(browser, null, no_audio_resumed);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-}
-
-function* suspended_block(url, browser) {
-  info("### Start test for suspended-block ###");
-  browser.loadURI(url);
-
-  info("- page should have playing audio -");
-  yield wait_for_event(browser, "DOMAudioPlaybackStarted");
-
-  info("- the default suspended state of all audio should be non-suspened-");
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-
-  info("- block autoplay audio -");
-  browser.blockMedia();
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_BLOCK,
-                                   check_autoplay_audio_suspended);
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_nonautoplay_audio_suspended);
-
-  info("- no audio can be playback during suspended-block -");
-  yield ContentTask.spawn(browser, SuspendedType.SUSPENDED_BLOCK,
-                                   play_nonautoplay_audio_should_be_blocked);
-
-  info("- both audio should be resumed at the same time -");
-  browser.resumeMedia();
-  yield ContentTask.spawn(browser, SuspendedType.NONE_SUSPENDED,
-                                   check_all_audio_suspended);
-}
-
-add_task(function* setup_test_preference() {
-  yield new Promise(resolve => {
-    SpecialPowers.pushPrefEnv({"set": [
-      ["media.useAudioChannelService.testing", true]
-    ]}, resolve);
-  });
-});
-
-add_task(function* test_suspended_pause() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_pause.bind(this, PAGE));
-});
-
-add_task(function* test_suspended_pause_disposable() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_pause_disposable.bind(this, PAGE));
-});
-
-add_task(function* test_suspended_stop_disposable() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_stop_disposable.bind(this, PAGE));
-});
-
-add_task(function* test_suspended_block() {
-  yield BrowserTestUtils.withNewTab({
-      gBrowser,
-      url: "about:blank"
-    }, suspended_block.bind(this, PAGE));
-});
diff --git a/toolkit/content/tests/browser/browser_mute.js b/toolkit/content/tests/browser/browser_mute.js
deleted file mode 100644
index f4829b808..000000000
--- a/toolkit/content/tests/browser/browser_mute.js
+++ /dev/null
@@ -1,16 +0,0 @@
-const PAGE = "data:text/html,page";
-
-function* test_on_browser(browser) {
-  ok(!browser.audioMuted, "Audio should not be muted by default");
-  browser.mute();
-  ok(browser.audioMuted, "Audio should be muted now");
-  browser.unmute();
-  ok(!browser.audioMuted, "Audio should be unmuted now");
-}
-
-add_task(function*() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: PAGE,
-  }, test_on_browser);
-});
diff --git a/toolkit/content/tests/browser/browser_mute2.js b/toolkit/content/tests/browser/browser_mute2.js
deleted file mode 100644
index 38f415b71..000000000
--- a/toolkit/content/tests/browser/browser_mute2.js
+++ /dev/null
@@ -1,26 +0,0 @@
-const PAGE = "data:text/html,page";
-
-function* test_on_browser(browser) {
-  ok(!browser.audioMuted, "Audio should not be muted by default");
-  browser.mute();
-  ok(browser.audioMuted, "Audio should be muted now");
-
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: PAGE,
-  }, test_on_browser2);
-
-  browser.unmute();
-  ok(!browser.audioMuted, "Audio should be unmuted now");
-}
-
-function* test_on_browser2(browser) {
-  ok(!browser.audioMuted, "Audio should not be muted by default");
-}
-
-add_task(function*() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: PAGE,
-  }, test_on_browser);
-});
diff --git a/toolkit/content/tests/browser/browser_quickfind_editable.js b/toolkit/content/tests/browser/browser_quickfind_editable.js
deleted file mode 100644
index d4ab59744..000000000
--- a/toolkit/content/tests/browser/browser_quickfind_editable.js
+++ /dev/null
@@ -1,47 +0,0 @@
-const PAGE = "data:text/html,<div contenteditable>foo</div><input><textarea></textarea>";
-const DESIGNMODE_PAGE = "data:text/html,<body onload='document.designMode=\"on\";'>";
-const HOTKEYS = ["/", "'"];
-
-function* test_hotkeys(browser, expected) {
-  let findbar = gBrowser.getFindBar();
-  for (let key of HOTKEYS) {
-    is(findbar.hidden, true, "findbar is hidden");
-    yield BrowserTestUtils.sendChar(key, gBrowser.selectedBrowser);
-    is(findbar.hidden, expected, "findbar should" + (expected ? "" : " not") + " be hidden");
-    if (!expected) {
-      yield closeFindbarAndWait(findbar);
-    }
-  }
-}
-
-function* focus_element(browser, query) {
-  yield ContentTask.spawn(browser, query, function* focus(query) {
-    let element = content.document.querySelector(query);
-    element.focus();
-  });
-}
-
-add_task(function* test_hotkey_on_editable_element() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: PAGE
-  }, function* do_tests(browser) {
-    yield test_hotkeys(browser, false);
-    const ELEMENTS = ["div", "input", "textarea"];
-    for (let elem of ELEMENTS) {
-      yield focus_element(browser, elem);
-      yield test_hotkeys(browser, true);
-      yield focus_element(browser, ":root");
-      yield test_hotkeys(browser, false);
-    }
-  });
-});
-
-add_task(function* test_hotkey_on_designMode_document() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: DESIGNMODE_PAGE
-  }, function* do_tests(browser) {
-    yield test_hotkeys(browser, true);
-  });
-});
diff --git a/toolkit/content/tests/browser/browser_saveImageURL.js b/toolkit/content/tests/browser/browser_saveImageURL.js
deleted file mode 100644
index 75e1cfdcd..000000000
--- a/toolkit/content/tests/browser/browser_saveImageURL.js
+++ /dev/null
@@ -1,68 +0,0 @@
-"use strict";
-
-const IMAGE_PAGE = "https://example.com/browser/toolkit/content/tests/browser/image_page.html";
-const PREF_UNSAFE_FORBIDDEN = "dom.ipc.cpows.forbid-unsafe-from-browser";
-
-MockFilePicker.init(window);
-MockFilePicker.returnValue = MockFilePicker.returnCancel;
-
-registerCleanupFunction(function() {
-  MockFilePicker.cleanup();
-});
-
-function waitForFilePicker() {
-  return new Promise((resolve) => {
-    MockFilePicker.showCallback = () => {
-      MockFilePicker.showCallback = null;
-      ok(true, "Saw the file picker");
-      resolve();
-    }
-  })
-}
-
-/**
- * Test that saveImageURL works when we pass in the aIsContentWindowPrivate
- * argument instead of a document. This is the preferred API.
- */
-add_task(function* preferred_API() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: IMAGE_PAGE,
-  }, function*(browser) {
-    let url = yield ContentTask.spawn(browser, null, function*() {
-      let image = content.document.getElementById("image");
-      return image.href;
-    });
-
-    saveImageURL(url, "image.jpg", null, true, false, null, null, null, null, false);
-    yield waitForFilePicker();
-  });
-});
-
-/**
- * Test that saveImageURL will still work when passed a document instead
- * of the aIsContentWindowPrivate argument. This is the deprecated API, and
- * will not work in apps using remote browsers having PREF_UNSAFE_FORBIDDEN
- * set to true.
- */
-add_task(function* deprecated_API() {
-  yield BrowserTestUtils.withNewTab({
-    gBrowser,
-    url: IMAGE_PAGE,
-  }, function*(browser) {
-    yield pushPrefs([PREF_UNSAFE_FORBIDDEN, false]);
-
-    let url = yield ContentTask.spawn(browser, null, function*() {
-      let image = content.document.getElementById("image");
-      return image.href;
-    });
-
-    // Now get the document directly from content. If we run this test with
-    // e10s-enabled, this will be a CPOW, which is forbidden. We'll just
-    // pass the XUL document instead to test this interface.
-    let doc = document;
-
-    saveImageURL(url, "image.jpg", null, true, false, null, doc, null, null);
-    yield waitForFilePicker();
-  });
-});
diff --git a/toolkit/content/tests/browser/browser_save_resend_postdata.js b/toolkit/content/tests/browser/browser_save_resend_postdata.js
deleted file mode 100644
index 602a13d22..000000000
--- a/toolkit/content/tests/browser/browser_save_resend_postdata.js
+++ /dev/null
@@ -1,145 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-var MockFilePicker = SpecialPowers.MockFilePicker;
-MockFilePicker.init(window);
-
-/**
- * Test for bug 471962 <https://bugzilla.mozilla.org/show_bug.cgi?id=471962>:
- * When saving an inner frame as file only, the POST data of the outer page is
- * sent to the address of the inner page.
- *
- * Test for bug 485196 <https://bugzilla.mozilla.org/show_bug.cgi?id=485196>:
- * Web page generated by POST is retried as GET when Save Frame As used, and the
- * page is no longer in the cache.
- */
-function test() {
-  waitForExplicitFinish();
-
-  gBrowser.loadURI("http://mochi.test:8888/browser/toolkit/content/tests/browser/data/post_form_outer.sjs");
-
-  gBrowser.addEventListener("pageshow", function pageShown(event) {
-    if (event.target.location == "about:blank")
-      return;
-    gBrowser.removeEventListener("pageshow", pageShown);
-
-    // Submit the form in the outer page, then wait for both the outer
-    // document and the inner frame to be loaded again.
-    gBrowser.addEventListener("DOMContentLoaded", handleOuterSubmit);
-    gBrowser.contentDocument.getElementById("postForm").submit();
-  });
-
-  var framesLoaded = 0;
-  var innerFrame;
-
-  function handleOuterSubmit() {
-    if (++framesLoaded < 2)
-      return;
-
-    gBrowser.removeEventListener("DOMContentLoaded", handleOuterSubmit);
-
-    innerFrame = gBrowser.contentDocument.getElementById("innerFrame");
-
-    // Submit the form in the inner page.
-    gBrowser.addEventListener("DOMContentLoaded", handleInnerSubmit);
-    innerFrame.contentDocument.getElementById("postForm").submit();
-  }
-
-  function handleInnerSubmit() {
-    gBrowser.removeEventListener("DOMContentLoaded", handleInnerSubmit);
-
-    // Create the folder the page will be saved into.
-    var destDir = createTemporarySaveDirectory();
-    var file = destDir.clone();
-    file.append("no_default_file_name");
-    MockFilePicker.returnFiles = [file];
-    MockFilePicker.showCallback = function(fp) {
-      MockFilePicker.filterIndex = 1; // kSaveAsType_URL
-    };
-
-    mockTransferCallback = onTransferComplete;
-    mockTransferRegisterer.register();
-
-    registerCleanupFunction(function () {
-      mockTransferRegisterer.unregister();
-      MockFilePicker.cleanup();
-      destDir.remove(true);
-    });
-
-    var docToSave = innerFrame.contentDocument;
-    // We call internalSave instead of saveDocument to bypass the history
-    // cache.
-    internalSave(docToSave.location.href, docToSave, null, null,
-                 docToSave.contentType, false, null, null,
-                 docToSave.referrer ? makeURI(docToSave.referrer) : null,
-                 docToSave, false, null);
-  }
-
-  function onTransferComplete(downloadSuccess) {
-    ok(downloadSuccess, "The inner frame should have been downloaded successfully");
-
-    // Read the entire saved file.
-    var file = MockFilePicker.returnFiles[0];
-    var fileContents = readShortFile(file);
-
-    // Check if outer POST data is found (bug 471962).
-    is(fileContents.indexOf("inputfield=outer"), -1,
-       "The saved inner frame does not contain outer POST data");
-
-    // Check if inner POST data is found (bug 485196).
-    isnot(fileContents.indexOf("inputfield=inner"), -1,
-          "The saved inner frame was generated using the correct POST data");
-
-    finish();
-  }
-}
-
-Cc["@mozilla.org/moz/jssubscript-loader;1"]
-  .getService(Ci.mozIJSSubScriptLoader)
-  .loadSubScript("chrome://mochitests/content/browser/toolkit/content/tests/browser/common/mockTransfer.js",
-                 this);
-
-function createTemporarySaveDirectory() {
-  var saveDir = Cc["@mozilla.org/file/directory_service;1"]
-                  .getService(Ci.nsIProperties)
-                  .get("TmpD", Ci.nsIFile);
-  saveDir.append("testsavedir");
-  if (!saveDir.exists())
-    saveDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755);
-  return saveDir;
-}
-
-/**
- * Reads the contents of the provided short file (up to 1 MiB).
- *
- * @param aFile
- *        nsIFile object pointing to the file to be read.
- *
- * @return
- *        String containing the raw octets read from the file.
- */
-function readShortFile(aFile) {
-  var inputStream = Cc["@mozilla.org/network/file-input-stream;1"]
-                      .createInstance(Ci.nsIFileInputStream);
-  inputStream.init(aFile, -1, 0, 0);
-  try {
-    var scrInputStream = Cc["@mozilla.org/scriptableinputstream;1"]
-                           .createInstance(Ci.nsIScriptableInputStream);
-    scrInputStream.init(inputStream);
-    try {
-      // Assume that the file is much shorter than 1 MiB.
-      return scrInputStream.read(1048576);
-    }
-    finally {
-      // Close the scriptable stream after reading, even if the operation
-      // failed.
-      scrInputStream.close();
-    }
-  }
-  finally {
-    // Close the stream after reading, if it is still open, even if the read
-    // operation failed.
-    inputStream.close();
-  }
-}
diff --git a/toolkit/content/tests/browser/common/mockTransfer.js b/toolkit/content/tests/browser/common/mockTransfer.js
deleted file mode 100644
index c8b8fc161..000000000
--- a/toolkit/content/tests/browser/common/mockTransfer.js
+++ /dev/null
@@ -1,67 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-Cc["@mozilla.org/moz/jssubscript-loader;1"]
-  .getService(Ci.mozIJSSubScriptLoader)
-  .loadSubScript("chrome://mochikit/content/tests/SimpleTest/MockObjects.js", this);
-
-var mockTransferCallback;
-
-/**
- * This "transfer" object implementation continues the currently running test
- * when the download is completed, reporting true for success or false for
- * failure as the first argument of the testRunner.continueTest function.
- */
-function MockTransfer() {
-  this._downloadIsSuccessful = true;
-}
-
-MockTransfer.prototype = {
-  QueryInterface: XPCOMUtils.generateQI([
-    Ci.nsIWebProgressListener,
-    Ci.nsIWebProgressListener2,
-    Ci.nsITransfer,
-  ]),
-
-  /* nsIWebProgressListener */
-  onStateChange: function MTFC_onStateChange(aWebProgress, aRequest,
-                                             aStateFlags, aStatus) {
-    // If at least one notification reported an error, the download failed.
-    if (!Components.isSuccessCode(aStatus))
-      this._downloadIsSuccessful = false;
-
-    // If the download is finished
-    if ((aStateFlags & Ci.nsIWebProgressListener.STATE_STOP) &&
-        (aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK))
-      // Continue the test, reporting the success or failure condition.
-      mockTransferCallback(this._downloadIsSuccessful);
-  },
-  onProgressChange: function () {},
-  onLocationChange: function () {},
-  onStatusChange: function MTFC_onStatusChange(aWebProgress, aRequest, aStatus,
-                                               aMessage) {
-    // If at least one notification reported an error, the download failed.
-    if (!Components.isSuccessCode(aStatus))
-      this._downloadIsSuccessful = false;
-  },
-  onSecurityChange: function () {},
-
-  /* nsIWebProgressListener2 */
-  onProgressChange64: function () {},
-  onRefreshAttempted: function () {},
-
-  /* nsITransfer */
-  init: function() {},
-  setSha256Hash: function() {},
-  setSignatureInfo: function() {}
-};
-
-// Create an instance of a MockObjectRegisterer whose methods can be used to
-// temporarily replace the default "@mozilla.org/transfer;1" object factory with
-// one that provides the mock implementation above. To activate the mock object
-// factory, call the "register" method. Starting from that moment, all the
-// transfer objects that are requested will be mock objects, until the
-// "unregister" method is called.
-var mockTransferRegisterer =
-  new MockObjectRegisterer("@mozilla.org/transfer;1",  MockTransfer);
diff --git a/toolkit/content/tests/browser/data/post_form_inner.sjs b/toolkit/content/tests/browser/data/post_form_inner.sjs
deleted file mode 100644
index ce72159d8..000000000
--- a/toolkit/content/tests/browser/data/post_form_inner.sjs
+++ /dev/null
@@ -1,31 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-const CC = Components.Constructor;
-const BinaryInputStream = CC("@mozilla.org/binaryinputstream;1",
-                             "nsIBinaryInputStream",
-                             "setInputStream");
-
-function handleRequest(request, response)
-{
-  var body =
-   '<html>\
-    <body>\
-    Inner POST data: ';
-
-  var bodyStream = new BinaryInputStream(request.bodyInputStream);
-  var bytes = [], avail = 0;
-  while ((avail = bodyStream.available()) > 0)
-   body += String.fromCharCode.apply(String, bodyStream.readByteArray(avail));
-
-  body +=
-    '<form id="postForm" action="post_form_inner.sjs" method="post">\
-     <input type="text" name="inputfield" value="inner">\
-     <input type="submit">\
-     </form>\
-     </body>\
-     </html>';
-
-  response.bodyOutputStream.write(body, body.length);
-}
diff --git a/toolkit/content/tests/browser/data/post_form_outer.sjs b/toolkit/content/tests/browser/data/post_form_outer.sjs
deleted file mode 100644
index 89256fcfb..000000000
--- a/toolkit/content/tests/browser/data/post_form_outer.sjs
+++ /dev/null
@@ -1,34 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-const CC = Components.Constructor;
-const BinaryInputStream = CC("@mozilla.org/binaryinputstream;1",
-                             "nsIBinaryInputStream",
-                             "setInputStream");
-
-function handleRequest(request, response)
-{
-  var body =
-   '<html>\
-    <body>\
-    Outer POST data: ';
-
-  var bodyStream = new BinaryInputStream(request.bodyInputStream);
-  var bytes = [], avail = 0;
-  while ((avail = bodyStream.available()) > 0)
-   body += String.fromCharCode.apply(String, bodyStream.readByteArray(avail));
-
-  body +=
-    '<form id="postForm" action="post_form_outer.sjs" method="post">\
-     <input type="text" name="inputfield" value="outer">\
-     <input type="submit">\
-     </form>\
-     \
-     <iframe id="innerFrame" src="post_form_inner.sjs" width="400" height="200">\
-     \
-     </body>\
-     </html>';
-
-  response.bodyOutputStream.write(body, body.length);
-}
diff --git a/toolkit/content/tests/browser/empty.png b/toolkit/content/tests/browser/empty.png
deleted file mode 100644
index 17ddf0c3e..000000000
--- a/toolkit/content/tests/browser/empty.png
+++ /dev/null
diff --git a/toolkit/content/tests/browser/file_contentTitle.html b/toolkit/content/tests/browser/file_contentTitle.html
deleted file mode 100644
index 8d330aa0f..000000000
--- a/toolkit/content/tests/browser/file_contentTitle.html
+++ /dev/null
@@ -1,14 +0,0 @@
-<html>
-<head><title>Test Page</title></head>
-<body>
-<script type="text/javascript">
-dump("Script!\n");
-addEventListener("load", () => {
-  // Trigger an onLocationChange event. We want to make sure the title is still correct afterwards.
-  location.hash = "#x2";
-  var event = new Event("TestLocationChange");
-  document.dispatchEvent(event);
-}, false);
-</script>
-</body>
-</html>
diff --git a/toolkit/content/tests/browser/file_mediaPlayback.html b/toolkit/content/tests/browser/file_mediaPlayback.html
deleted file mode 100644
index 5df0bc154..000000000
--- a/toolkit/content/tests/browser/file_mediaPlayback.html
+++ /dev/null
@@ -1,9 +0,0 @@
-<!DOCTYPE html>
-<script type="text/javascript">
-var audio = new Audio();
-audio.oncanplay = function() {
-  audio.oncanplay = null;
-  audio.play();
-};
-audio.src = "audio.ogg";
-</script>
diff --git a/toolkit/content/tests/browser/file_mediaPlayback2.html b/toolkit/content/tests/browser/file_mediaPlayback2.html
deleted file mode 100644
index dffbd299b..000000000
--- a/toolkit/content/tests/browser/file_mediaPlayback2.html
+++ /dev/null
@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<body>
-<script type="text/javascript">
-var audio = new Audio();
-audio.oncanplay = function() {
-  audio.oncanplay = null;
-  audio.play();
-};
-audio.src = "audio.ogg";
-document.body.appendChild(audio);
-</script>
-</body>
diff --git a/toolkit/content/tests/browser/file_mediaPlaybackFrame.html b/toolkit/content/tests/browser/file_mediaPlaybackFrame.html
deleted file mode 100644
index 119db62ec..000000000
--- a/toolkit/content/tests/browser/file_mediaPlaybackFrame.html
+++ /dev/null
@@ -1,2 +0,0 @@
-<!DOCTYPE html>
-<iframe src="file_mediaPlayback.html"></iframe>
diff --git a/toolkit/content/tests/browser/file_mediaPlaybackFrame2.html b/toolkit/content/tests/browser/file_mediaPlaybackFrame2.html
deleted file mode 100644
index d96a4cd4e..000000000
--- a/toolkit/content/tests/browser/file_mediaPlaybackFrame2.html
+++ /dev/null
@@ -1,2 +0,0 @@
-<!DOCTYPE html>
-<iframe src="file_mediaPlayback2.html"></iframe>
diff --git a/toolkit/content/tests/browser/file_multipleAudio.html b/toolkit/content/tests/browser/file_multipleAudio.html
deleted file mode 100644
index 5dc37febb..000000000
--- a/toolkit/content/tests/browser/file_multipleAudio.html
+++ /dev/null
@@ -1,19 +0,0 @@
-<!DOCTYPE html>
-<head>
-  <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
-  <meta content="utf-8" http-equiv="encoding">
-</head>
-<body>
-<audio id="autoplay" src="audio.ogg"></audio>
-<audio id="nonautoplay" src="audio.ogg"></audio>
-<script type="text/javascript">
-
-// In linux debug on try server, sometimes the download process would fail, so
-// we can't activate the "auto-play" or playing after receving "oncanplay".
-// Therefore, we just call play here.
-var audio = document.getElementById("autoplay");
-audio.loop = true;
-audio.play();
-
-</script>
-</body>
diff --git a/toolkit/content/tests/browser/file_multiplePlayingAudio.html b/toolkit/content/tests/browser/file_multiplePlayingAudio.html
deleted file mode 100644
index ae122506f..000000000
--- a/toolkit/content/tests/browser/file_multiplePlayingAudio.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!DOCTYPE html>
-<head>
-  <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
-  <meta content="utf-8" http-equiv="encoding">
-</head>
-<body>
-<audio id="audio1" src="audio.ogg" controls></audio>
-<audio id="audio2" src="audio.ogg" controls></audio>
-<script type="text/javascript">
-
-// In linux debug on try server, sometimes the download process would fail, so
-// we can't activate the "auto-play" or playing after receving "oncanplay".
-// Therefore, we just call play here.
-var audio1 = document.getElementById("audio1");
-audio1.loop = true;
-audio1.play();
-
-var audio2 = document.getElementById("audio2");
-audio2.loop = true;
-audio2.play();
-
-</script>
-</body>
diff --git a/toolkit/content/tests/browser/file_redirect.html b/toolkit/content/tests/browser/file_redirect.html
deleted file mode 100644
index 4d5fa9dfd..000000000
--- a/toolkit/content/tests/browser/file_redirect.html
+++ /dev/null
@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>redirecting...</title>
-<script>
-window.addEventListener("load",
-  () => window.location = "file_redirect_to.html");
-</script>
-<body>
-redirectin u bro
-</body>
-</html>
diff --git a/toolkit/content/tests/browser/file_redirect_to.html b/toolkit/content/tests/browser/file_redirect_to.html
deleted file mode 100644
index 28c0b5371..000000000
--- a/toolkit/content/tests/browser/file_redirect_to.html
+++ /dev/null
@@ -1,15 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>redirected!</title>
-<script>
-window.addEventListener("load", () => {
-  var event = new Event("RedirectDone");
-  document.dispatchEvent(event);
-});
-</script>
-<body>
-u got redirected, bro
-</body>
-</html>
diff --git a/toolkit/content/tests/browser/head.js b/toolkit/content/tests/browser/head.js
deleted file mode 100644
index d7ed7a9ff..000000000
--- a/toolkit/content/tests/browser/head.js
+++ /dev/null
@@ -1,123 +0,0 @@
-"use strict";
-
-Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
-
-XPCOMUtils.defineLazyModuleGetter(this, "Promise",
-  "resource://gre/modules/Promise.jsm");
-
-/**
- * A wrapper for the findbar's method "close", which is not synchronous
- * because of animation.
- */
-function closeFindbarAndWait(findbar) {
-  return new Promise((resolve) => {
-    if (findbar.hidden) {
-      resolve();
-      return;
-    }
-    findbar.addEventListener("transitionend", function cont(aEvent) {
-      if (aEvent.propertyName != "visibility") {
-        return;
-      }
-      findbar.removeEventListener("transitionend", cont);
-      resolve();
-    });
-    findbar.close();
-  });
-}
-
-function pushPrefs(...aPrefs) {
-  let deferred = Promise.defer();
-  SpecialPowers.pushPrefEnv({"set": aPrefs}, deferred.resolve);
-  return deferred.promise;
-}
-
-/**
- * Helper class for testing datetime input picker widget
- */
-class DateTimeTestHelper {
-  constructor() {
-    this.panel = document.getElementById("DateTimePickerPanel");
-    this.panel.setAttribute("animate", false);
-    this.tab = null;
-    this.frame = null;
-  }
-
-  /**
-   * Opens a new tab with the URL of the test page, and make sure the picker is
-   * ready for testing.
-   *
-   * @param  {String} pageUrl
-   */
-  async openPicker(pageUrl) {
-    this.tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, pageUrl);
-    await BrowserTestUtils.synthesizeMouseAtCenter("input", {}, gBrowser.selectedBrowser);
-    // If dateTimePopupFrame doesn't exist yet, wait for the binding to be attached
-    if (!this.panel.dateTimePopupFrame) {
-      await BrowserTestUtils.waitForEvent(this.panel, "DateTimePickerBindingReady")
-    }
-    this.frame = this.panel.dateTimePopupFrame;
-    await this.waitForPickerReady();
-  }
-
-  async waitForPickerReady() {
-    await BrowserTestUtils.waitForEvent(this.frame, "load", true);
-    // Wait for picker elements to be ready
-    await BrowserTestUtils.waitForEvent(this.frame.contentDocument, "PickerReady");
-  }
-
-  /**
-   * Find an element on the picker.
-   *
-   * @param  {String} selector
-   * @return {DOMElement}
-   */
-  getElement(selector) {
-    return this.frame.contentDocument.querySelector(selector);
-  }
-
-  /**
-   * Find the children of an element on the picker.
-   *
-   * @param  {String} selector
-   * @return {Array<DOMElement>}
-   */
-  getChildren(selector) {
-    return Array.from(this.getElement(selector).children);
-  }
-
-  /**
-   * Click on an element
-   *
-   * @param  {DOMElement} element
-   */
-  click(element) {
-    EventUtils.synthesizeMouseAtCenter(element, {}, this.frame.contentWindow);
-  }
-
-  /**
-   * Close the panel and the tab
-   */
-  async tearDown() {
-    if (!this.panel.hidden) {
-      let pickerClosePromise = new Promise(resolve => {
-        this.panel.addEventListener("popuphidden", resolve, {once: true});
-      });
-      this.panel.hidePopup();
-      this.panel.closePicker();
-      await pickerClosePromise;
-    }
-    await BrowserTestUtils.removeTab(this.tab);
-    this.tab = null;
-  }
-
-  /**
-   * Clean up after tests. Remove the frame to prevent leak.
-   */
-  cleanup() {
-    this.frame.remove();
-    this.frame = null;
-    this.panel.removeAttribute("animate");
-    this.panel = null;
-  }
-}
diff --git a/toolkit/content/tests/browser/image.jpg b/toolkit/content/tests/browser/image.jpg
deleted file mode 100644
index 5031808ad..000000000
--- a/toolkit/content/tests/browser/image.jpg
+++ /dev/null
diff --git a/toolkit/content/tests/browser/image_page.html b/toolkit/content/tests/browser/image_page.html
deleted file mode 100644
index 522a1d8cf..000000000
--- a/toolkit/content/tests/browser/image_page.html
+++ /dev/null
@@ -1,9 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>OHAI</title>
-<body>
-<img id="image" src="image.jpg" />
-</body>
-</html>